Document:

*The redacted portions of this contract have been omitted pending the outcome of
a  confidential  treatment  request  filed  with  the  Securities  and  Exchange
Commission.*

                CAPACITY AND DARK FIBER IRU PURCHASE AGREEMENT

            THIS CAPACITY AND DARK FIBER IRU PURCHASE AGREEMENT (the Agreement")
is made and  entered  into as of the 11th day of  April,  2000  (the  "Effective
Date"), by and between LEVEL 3 LANDING STATION INC., a corporation organized and
existing under the laws of the State of Delaware,  LEVEL 3 (BERMUDA)  LIMITED, a
corporation  organized  and  existing  under  the laws of  Bermuda,  and LEVEL 3
COMMUNICATIONS  LIMITED, a corporation  organized and existing under the laws of
England, (collectively "Level 3"), and VIATEL, INC., a corporation organized and
existing under the laws of the State of Delaware ("Viatel").

                                    RECITALS

            WHEREAS,  Level 3 has entered into certain  agreements  (the "System
Agreements")  whereby  Level 3 owns or  obtains  the  right  to use and  re-sell
certain  telecommunications  capacity on the Atlantic Crossing 1 submarine cable
system  ("AC-1") and certain  telecommunications  capacity and/or dark fibers in
certain  terrestrial  (backhaul and  interlink)  cable systems in the USA and UK
(collectively the "AC/Backhaul System").

            WHEREAS,  Viatel  desires  to  acquire  certain   telecommunications
capacity and dark fibers.

            WHEREAS,  Level 3 and Viatel have  simultaneously  herewith executed
that certain Fiber Purchase  Agreement  ("Fiber  Agreement"),  pursuant to which
Viatel has agreed to purchase certain fiber from Level 3 in the Yellow Submarine
cable system between the USA and the UK (the "Yellow System").

            NOW,  THEREFORE,  the parties hereto, in consideration of the mutual
covenants  contained herein and in the Fiber Agreement,  covenant and agree with
each other as follows:

1.    DEFINITIONS.  Capitalized terms used herein shall have the following
      meanings:

      A.    "AC-1" shall have the meaning set forth in the Recitals hereto.

      B.    "AC-1  CAPACITY"  shall  mean  20 Gbps  of  unprotected  restoration
            capacity on AC-1 as more particularly described on Exhibit "A."

      C.    "AC-1 TERM" shall mean the period during which Viatel has the IRU in
            the AC-1 Capacity.

      D.    "AC/BACKHAUL  SYSTEM"  shall  have  the  meaning  set  forth  in the
            Recitals hereto.

      E.    "AO&M PAYMENTS" shall have the meaning set forth in Section 3.

      F.    "AO&M PLAN" shall have the meaning set forth in Section 3.

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      G.    "BACKHAUL  FIBERS"  shall  mean one pair of dark  fibers  along  two
            diverse  routes  generally  running  between the Yellow System cable
            landing station in Bude, Cornwall, UK and a Level 3 gateway facility
            located  at 6  Braham  Street,  in  London,  UK and one pair of dark
            fibers along two diverse routes generally running between the Yellow
            System cable landing station in Bellport, Long Island, New York, USA
            and the Level 3 gateway  facility  located  at 111 8th Avenue in New
            York, New York, USA; the technical  specifications  for the Backhaul
            Fibers,  together with the construction  and conduit  specifications
            relating thereto, are set forth on Exhibit "B".

      H.    "BACKHAUL  TERM" shall mean the period  during  which Viatel has the
            IRU in the Backhaul Fibers.

      I.    "COLOCATION  AGREEMENT" shall mean that certain Colocation Agreement
            entered   into   between   Level   3  and   Viatel   more   or  less
            contemporaneously herewith.

      J.    "DOLLARS" or "$" shall mean United States dollars.

      K.    "FIBER  AGREEMENT"  shall have the meaning set forth in the Recitals
            hereto.

      L.    "FIBER  PAYMENT  DATE"  shall  mean the  date of full  and  complete
            payment by Viatel of (a) the Purchase Price (as defined in the Fiber
            Agreement)  for  the  Purchased  Fiber  (as  defined  in  the  Fiber
            Agreement),  (b) the Purchase  Price for the Purchased  Capacity and
            Fibers,  and (c) the License  Payment (as defined in the  Colocation
            Agreement)  for the  Colocation  Space (as defined in the Colocation
            Agreement).

      M.    "INTERLINK  CAPACITY" 20 Gbps of  unprotected  capacity  between the
            AC-1 cable landing stations and Yellow System cable landing stations
            in the USA and UK.

      N.    "INTERLINK  TERM" shall mean the period  during which Viatel has the
            IRU in the Interlink Capacity.

      O.    "IRU" shall mean an indefeasible  (except as set forth herein) right
            to use the Purchased  Capacity and Fibers,  subject to and under the
            terms set forth herein, for the duration specified herein.

      P.    "PAYMENT DUE DATE" shall mean the due date for payments hereunder by
            Viatel.

      Q.    "PERMITS" shall have the meaning set forth in Section 8.

      R.    "PURCHASE PRICE" shall mean the aggregate  purchase price payable by
            Viatel for the Purchased Capacity and Fibers, or [REDACTED].

      S.    "PURCHASED  CAPACITY AND FIBERS" shall mean the Backhaul Fibers, the
            Interlink Capacity and the AC-1 Capacity.

      T.    "RFS DATE" shall have the meaning set forth in the Fiber Agreement.

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      U.    "SYSTEM AGREEMENTS" shall have the meaning set forth in the Recitals
            hereto.

      V.    "SYSTEM  OPERATOR"  shall mean the owners and  operators  (which may
            include Level 3) of the AC/Backhaul System.

      W.    "TAXES" shall have the meaning set forth in Section 2.E.

      X.    "TERM" shall mean the period  commencing with the Fiber Payment Date
            and ending on the  expiration  of the Backhaul  Term,  the Interlink
            Term or the AC-1 Term, whichever is later.

2.    IRU.

      A.    AC-1  CAPACITY.  In  consideration  for the payment of the  Purchase
            Price, Level 3 hereby agrees to grant to Viatel an IRU, for the AC-1
            Term, in the AC-1  Capacity,  on the terms and  conditions set forth
            herein.  The IRU in the AC-1  Capacity  shall  commence  and  become
            effective as of the Fiber Payment Date.

      B.    BACKHAUL FIBERS.  In  consideration  for the payment of the Purchase
            Price,  Level 3 hereby  agrees to grant to  Viatel  an IRU,  for the
            Backhaul Term, in the Backhaul  Fibers,  on the terms and conditions
            set forth herein.  The IRU in the Backhaul Fibers shall commence and
            become effective as of the Fiber Payment Date.

      C.    INTERLINK CAPACITY. In consideration for the payment of the Purchase
            Price,  Level 3 hereby  agrees to grant to  Viatel  an IRU,  for the
            Interlink  Term,  in  the  Interlink  Capacity,  on  the  terms  and
            conditions set forth herein. The IRU in the Interlink Capacity shall
            commence and become effective as of the Fiber Payment Date.

      D.    PURCHASE  PRICE. In  consideration  of the grants of IRUs to Viatel,
            Viatel  agrees  to  make  payments  of the  Purchase  Price  for the
            Purchased  Capacity  and Fibers to Level 3 on the  Payment Due Dates
            set forth below:

                  PAYMENT DUE DATE              AMOUNT DUE

                  [REDACTED]                    [REDACTED]

                              Purchase Price    [REDACTED]

            Viatel  shall,  on or before the  respective  Payment  Due Dates set
            forth above, pay to Level 3, in immediately  available Dollars,  the
            portion of the Purchase Price then due (provided  Level 3 shall give
            five (5)  business  days prior  notice of such  Payment  Due Date to
            Viatel for any Payment Due Date not  specifically  ascertainable  in
            the above schedule).

      E.    TAXES.  All payments  made by Viatel under this  Agreement  shall be
            made without any deduction or  withholding  for or on account of any
            tax, duty or other charges of whatever  nature imposed by any taxing

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            or governmental  authority  (collectively  "Taxes"). If Viatel is or
            was required by law to make any  deduction or  withholding  from any
            payment due  hereunder  to Level 3, or if Level 3 is required to pay
            any Taxes  (other  than net  income  taxes)  upon,  measured  by, or
            reasonably  attributable  to the Purchase Price or the cost or value
            of Purchased Capacity and Fibers, then,  notwithstanding anything to
            the contrary  contained in this Agreement,  the gross amount payable
            by  Viatel  to Level 3 will be  increased  so that,  after  any such
            deduction,  withholding  or other  payment of Taxes,  the net amount
            received  by  Level 3 will  not be  less  than  Level  3 would  have
            received had no such  deduction,  withholding  or other payment been
            required.  If any taxing or government authority asserts that Viatel
            should have made a deduction or withholding,  or Level 3 should have
            made any payment, for or on account of any Taxes with respect to all
            or a portion of any payment made hereunder,  Viatel hereby agrees to
            indemnify  Level 3 for such Taxes and hold  Level 3  harmless  on an
            after-tax  basis from and against any Taxes,  interest or  penalties
            levied or  asserted in  connection  therewith.  Viatel  shall not be
            responsible  under this Agreement for any Taxes payable with respect
            to other portions of the AC/Backhaul System.

3.    ADMINISTRATION, OPERATION AND MAINTENANCE OF AC/BACKHAUL SYSTEM.

      A.    PERFORMANCE.

            1)    Level 3 shall use  reasonable  efforts  to cause  each  System
                  Operator   to   establish   a  plan  (the   "AO&M   Plan")  to
                  administrate,  operate and maintain the AC/Backhaul  System in
                  efficient working order, in accordance with industry standards
                  and in  accordance  with the standards set forth in the System
                  Agreements.

            2)    Should any condition  exist in any segment of the  AC/Backhaul
                  System  that  may  impair  the  integrity  of the  AC/Backhaul
                  System,  Level  3  shall  request  that  the  relevant  System
                  Operator initiate and coordinate  planned  maintenance on such
                  relevant  segment which may include the  deactivation  of such
                  segment.  Level 3 shall, to the extent reasonably  practicable
                  (and to the  maximum  extent  allowable  under any  agreements
                  respecting such action), advise Viatel in writing prior to the
                  initiation of a planned maintenance operation,  of the timing,
                  scope and costs of such planned maintenance  operation and use
                  reasonable  efforts to minimize  disruption of the AC/Backhaul
                  System.

            3)    In the  event  of  disruption  of  service  of  the  Purchased
                  Capacity and Fibers,  Level 3 shall  request that the relevant
                  System  Operator  cause  service to be  restored as quickly as
                  reasonably  possible,  and  Level 3 shall  request  that  such
                  System Operator take such measures as are reasonably necessary
                  to obtain such objective.

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<PAGE>

            4)    Notwithstanding  anything  contained  herein to the  contrary,
                  Viatel  shall  be  responsible   for  all  costs  relating  to
                  acquisition,  installation  and  maintenance  of the equipment
                  necessary to light and operate the Backhaul Fibers.

      B.    AO&M PAYMENTS. For performance of the administration,  operation and
            maintenance of the AC/Backhaul  System,  Viatel shall pay to Level 3
            "AO&M Payments" as follows:

            1)    for the Backhaul Fibers, [REDACTED] per year, plus six percent
                  (6%) of such  costs as a  management  fee to Level 3 per year,
                  for each year of the Backhaul Term (Level 3 agrees that if its
                  costs   relating   to  the   administration,   operation   and
                  maintenance  of  the  Backhaul   Fibers  shall  be  less  than
                  [REDACTED] per year,  Level 3 shall reduce the AO&M Payment by
                  Viatel  by  such  savings;  however,  in no  event  shall  any
                  reduction  occur during the first  [REDACTED]  of the Backhaul
                  Term); and

            2)    for the Interlink  Capacity,  no additional  consideration  or
                  payments shall be payable by Viatel; and

            3)    for the AC-l Capacity,  a pro rata share of the costs incurred
                  by Level 3 for such  services,  based on the  ratio  which the
                  amount of AC-1 Capacity bears to the total capacity of Level 3
                  in  the  AC-1  portion  of  the  AC/Backhaul  System  obtained
                  simultaneously   with  the  AC-1  Capacity   (which  ratio  is
                  anticipated,  as of the Effective Date, to be [REDACTED], plus
                  [REDACTED]  of such costs as a management  fee to Level 3, for
                  each year of the AC-1 Term.

      C.    PAYMENT OF AO&M  PAYMENTS.  The AO&M  Payments  respecting  the AC-1
            Capacity shall be paid by Viatel as such costs are incurred by Level
            3.  Viatel  shall  have the right to audit the books and  records of
            Level 3  reasonably  necessary to verify the costs on which the AO&M
            Payments for the AC-1 Capacity and, after the first two (2) years of
            the Backhaul Term, the Backhaul Fibers, are based. The AO&M Payments
            respecting the Backhaul Fibers and Interlink Capacity shall commence
            on the RFS Date and shall continue on each  anniversary of said date
            during the Backhaul Term.

      D.    REVIEW  OF AO&M.  Level 3 and  Viatel  shall  meet  periodically  at
            mutually agreeable times to review AO&M procedures.

4.    INVOICES; DEFAULT INTEREST.

      A.    INVOICES.  Excluding scheduled payments of the Purchase Price, Level
            3 or its authorized agent shall render invoices under this Agreement
            in Dollars,  and Viatel shall pay such  invoiced  amounts in Dollars
            within  [REDACTED] after invoice.  Viatel shall make all payments by
            means of a wire  transfer  to an account or  accounts  specified  by
            Level 3. Level 3  reserves  the right to direct,  in  writing,  that
            payment be apportioned among the entities comprising

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<PAGE>

            Level  3  as  Level  3  directs,  or  to  separate  subsidiaries  or
            affiliates of Level 3.

      B.    DEFAULT INTEREST. Any amounts payable under this Agreement which are
            not paid within  [REDACTED]  of the  Payment  Due Date shall  accrue
            interest  (from the  Payment  Due Date) at an annual  rate  equal to
            [REDACTED]  above  the rate for U.S.  dollar  LIBOR for one month as
            published  in THE WALL STREET  JOURNAL on the first  business day of
            the month in which such payment is due. Such  interest  shall accrue
            from the day  following the date payment was due until it is paid in
            full. In the event that applicable law does not allow the imposition
            of "default  interest" at the rate  established  in accordance  with
            this Section 4.B, such "default  interest"  shall be at the lower of
            the rate provided in this  subsection or the highest rate  permitted
            by applicable  law. For purposes of this Section,  "paid" shall mean
            payment in funds that are  available  for  immediate use by Level 3.
            Viatel may avoid the  incurrence  of default  interest  or a payment
            default in the case of a bona fide  dispute  by (i)  giving  written
            notice of such dispute to level 3 prior to the Payment Due Date, and
            (ii) paying the non-disputed  amount to Level 3 and retaining,  in a
            segregated  Viatel account the disputed amount.  Viatel shall,  upon
            Level 3's request, deliver evidence of the retention of such sums in
            such  account.  The  resolution of such dispute shall be governed by
            Section 11. In the event Level 3 is determined to be entitled to all
            or any part of such  disputed  amount,  such amount shall be paid to
            Level 3 together with default  interest thereon from the Payment Due
            Date.

5.    DEFAULT.

      A.    VIATEL DEFAULT. If Viatel fails to pay any undisputed installment of
            the Purchase Price when due and such failure  continues for a period
            of [REDACTED]  after written notice from Level 3 to Viatel,  Level 3
            shall have the option to terminate this Agreement and all previously
            paid  installments  of the Purchase Price and any other sums paid by
            Viatel shall be non-refundable.  In the event of such termination of
            this  Agreement  by Level  3, the  Colocation  Agreement  and  Fiber
            Agreement shall automatically  terminate.  Except as immediately set
            forth  above,  if Viatel  fails to make a payment  required  by this
            Agreement,  or if Viatel is  otherwise  in  material  breach of this
            Agreement,  Level 3 may notify  Viatel in writing of such breach and
            if such  breach  is not fully  remedied  within  [REDACTED]  of such
            notification, Level 3 shall be entitled to pursue any and all rights
            and legal and equitable remedies,  including its rights and remedies
            to enforce Viatel's obligations under this Agreement.

      B.    LEVEL 3 DEFAULT. If Level 3 is in material breach of this Agreement,
            Viatel  may notify  Level 3 in  writing  of such  breach and if such
            breach is not fully remedied within [REDACTED] of such notification,
            Viatel shall be entitled to withhold payment of any obligations owed
            to Level 3, and may offset such  payments  against  any  obligations
            owed by Level 3 to Viatel, under this Agreement, the Fiber Agreement
            and the Colocation Agreement, and pursue any and all

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            rights and legal and  equitable  remedies,  including its rights and
            remedies to enforce Level 3's obligations under this Agreement.

6.    USE.

      A.    NON-INTERFERENCE.  Each party agrees that its use of the AC/Backhaul
            System  and  its  equipment  shall  be  such  as not  to  interrupt,
            interfere  with,  or  impair  service  over  any of  the  facilities
            comprising  the  AC/Backhaul   System,  or  impair  privacy  of  any
            communications over such facilities, cause damage to plant or create
            hazards to employees, affiliates or connecting companies of Level 3,
            any System Operator, Viatel, or any other user, owner or operator of
            the AC/Backhaul System or the public.

      B.    AVAILABILITY FOR TESTING AND MAINTENANCE. The Purchased Capacity and
            Fibers  granted to Viatel shall be made  available to Level 3 and/or
            the relevant  System  Operator (or its  contractors),  at such times
            agreeable  to  Viatel  and Level 3, to  permit  Level 3 and/or  such
            System  Operator  (or its  contractors)  to  conduct  such tests and
            adjustments  as may be necessary  for such capacity and fibers to be
            maintained in efficient working order.  Level 3 agrees to provide at
            least  seven (7) days (or such  longer  period as allowed  under any
            agreements respecting such action) written notice to Viatel prior to
            conducting  scheduled  maintenance  tests or adjustments which might
            affect Viatel's use of the Purchased  Capacity and Fibers and to use
            reasonable efforts to minimize disruption of the AC/Backhaul System.

      C.    COOPERATION.  In the event either party experiences a degradation or
            significant  interruption  in the performance of its capacity on the
            AC/Backhaul  System,  the  parties  shall  cooperate  to the  extent
            reasonable possible to minimize the impact of such occurrence.

7.    TERM.

      A.    BACKHAUL TERM. The Backhaul Term shall commence on the Fiber Payment
            Date and,  unless earlier  terminated  pursuant to the terms hereof,
            shall terminate on the [REDACTED] anniversary of the RFS Date.

      B.    AC-1 TERM.  The AC-1 Term shall  commence on the Fiber  Payment Date
            and, unless earlier terminated  pursuant to the terms hereof,  shall
            terminate on [REDACTED].

      C.    INTERLINK  TERM.  The  Interlink  Term shall  commence  on the Fiber
            Payment Date and,  unless earlier  terminated  pursuant to the terms
            hereof,  shall  terminate  on the  later of the  termination  of the
            Backhaul Term and the AC-l Term.

      D.    END OF TERM. Upon termination of the respective Term, the IRU in the
            relevant  Purchased Capacity and Fibers, and Level 3's obligation to
            maintain it, shall end. The  termination  of the Term (whether under
            this  Section,  or  otherwise)  shall not  relieve  Viatel  from any
            liabilities arising prior to such termination.

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      E.    TERMINATION OF OTHER AGREEMENTS.  Notwithstanding anything contained
            herein to the  contrary,  Viatel  acknowledges  and agrees that this
            Agreement  and the  Term  shall  automatically  terminate  upon  the
            occurrence  of a default on the part of Viatel under Section 6A1) of
            the Fiber  Agreement,  a default on the part of Viatel under Section
            13A of the  Colocation  Agreement,  or a  termination  of the  Fiber
            Agreement  under  Sections  12D or 12E  thereof.  In the  event of a
            termination of this Agreement as a result of the  termination of the
            Fiber Agreement  under Sections 12D or 12E thereof,  all portions of
            the  Purchase  Price  which  may have been made by Viatel to Level 3
            prior to such termination shall be refunded to Viatel.

8.    APPROVALS; LICENSES.

      A.    PERMITS.  The  performance of this Agreement by each party hereto is
            contingent  upon the obtaining and  continuance  of such  approvals,
            consents,  governmental  authorizations,  licenses  and permits (the
            "Permits") as may be required or reasonably deemed necessary by such
            party  for   performance  by  a  party   hereunder  and  as  may  be
            satisfactory  to it.  Level 3 and Viatel each  covenant and agree to
            use commercially  reasonable efforts to acquire or otherwise obtain,
            upon  commercially  reasonable  terms,  all necessary  Permits on or
            before the RFS Date.

      B.    CONTINGENCY.  The  performance  of  this  Agreement  by  Level  3 is
            contingent upon each System Operator obtaining,  and the continuance
            of, such Permits as may be required or reasonably  deemed  necessary
            by such System  Operator for  performance by such System Operator of
            the System  Agreements.  The parties shall use reasonable efforts to
            obtain  and  continue,  and  to  have  continued,   such  approvals,
            consents,  licenses and permits.  No license under patent is granted
            by Level 3 or shall be  implied  or arise by  estoppel  in  Viatel's
            favor with respect to any apparatus, system or method used by Viatel
            in connection with the use of the Purchased Capacity and Fibers.

9.    DISCLAIMER.

      A.    NO  WARRANTIES.  Level 3 has entered into the System  Agreements  to
            obtain the right to use plant,  equipment and services  necessary to
            allow the Purchased Capacity and Fibers to be placed into operation.
            VIATEL  ACKNOWLEDGES  AND AGREES  THAT LEVEL 3 IS NOT LIABLE FOR ANY
            SYSTEM  OPERATOR'S  FAILURE TO PERFORM UNDER THE SYSTEM  AGREEMENTS.
            UNLESS  SPECIFICALLY  SET FORTH IN THIS  AGREEMENT,  ALL WARRANTIES,
            EXPRESSED OR IMPLIED,  INCLUDING BUT NOT LIMITED TO, THE  WARRANTIES
            OF  MERCHANTABILITY  AND  FITNESS  FOR  A  PARTICULAR  PURPOSE,  ARE
            SPECIFICALLY  DISCLAIMED.  Nothing  contained  herein shall limit or
            impair  Viatel's  acceptance  rights  under  Section 2D of the Fiber
            Agreement or Viatel's rights under Section 9B below.

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      B.    ENFORCEMENT OF SYSTEM OPERATOR OBLIGATIONS. Level 3 shall diligently
            enforce any obligations and warranties of the System Operators,  and
            any benefits or payments received in respect thereof shall be shared
            proportionately with Viatel.

10.   LIMITATIONS OF LIABILITY.

      A.    DAMAGES.  In no event shall Viatel or Level 3 be liable to the other
            for   consequential,   incidental,   indirect  or  special  damages,
            including,  but not limited  to,  loss of revenue,  loss of business
            opportunity,  or the  costs  associated  with  the  use of  external
            restoration facilities,  including, without limitation, for any loss
            or damage  sustained by reason of any failure in or breakdown of the
            AC/Backhaul System or the facilities associated with the AC/Backhaul
            System, whatever the cause and however long it shall last.

      B.    FORCE  MAJEURE.  Neither  party shall be liable to the other for any
            loss or damage which may be suffered by reason of any  circumstances
            beyond  the  reasonable  control  of,  and not due to the  fault  or
            negligence of, such party.

11.   SETTLEMENT OF DISPUTES.

      A.    AMICABLE  RESOLUTION.  The parties shall endeavor to settle amicably
            by  mutual   discussions  any  disputes,   differences,   or  claims
            whatsoever related to this Agreement.  In the event that any dispute
            cannot be resolved  through  such  efforts,  then either party shall
            have the right to declare a deadlock (by delivery of written  notice
            to the other party) and thereby invoke the escalation procedures set
            forth below.  After  delivery of a notice of  deadlock,  the parties
            shall,  within  fourteen  (14) days after  delivery  of the  notice,
            escalate the dispute in the following  manner:  first, to the senior
            vice  president  or senior  management  personnel  for each  party's
            submarine  network  development/construction  group;  second, to the
            executive vice president or senior  management  personnel within the
            office of and reporting  directly to the Chief Executive Officers of
            the public  company  parent of each party (the  "Executive  Level");
            and,  finally  (failing  resolution at either level  above),  to the
            Chief  Executive  Officers  ("CEO") of the public  company parent of
            each  party.  Each party  agrees to use  reasonable  efforts to make
            necessary  management-level  personnel  reasonably available for the
            timely  resolution  of  same,  and  any  potential  impacts  on  the
            operation or construction of the AC/Backhaul System.

      B.    REMEDIES.  In the  event  that the  dispute  is not  resolved  after
            presentation  to the CEOs of the  parties,  then  either  party  may
            exercise any remedy  legally  available.  The parties agree that any
            action or proceeding relating to this Agreement shall be held in the
            U.S.  District Court for the Southern  District of New York or state
            courts located in the State of New York.  The parties  further agree
            that such  courts  shall  have  exclusive  jurisdiction  in any such
            action or proceeding.

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<PAGE>

12.   GOVERNING  LAW.  THIS  AGREEMENT  SHALL BE  GOVERNED BY AND  CONSTRUED  IN
      ACCORDANCE  WITH  THE LAWS OF THE  STATE OF NEW  YORK,  UNITED  STATES  OF
      AMERICA.

13.   WAIVER OF IMMUNITY.  The parties hereto acknowledge that this Agreement is
      commercial  in nature,  and each party hereto  expressly  and  irrevocably
      waives any claim or right which it may have to immunity (whether sovereign
      immunity,  act of state or otherwise) for itself or with respect to any of
      its assets in  connection  with an  arbitration,  arbitral  award or other
      proceeding  to enforce  this  Agreement,  including,  without  limitation,
      immunity  from service of process,  immunity of any of its assets from pre
      or  post   judgment   attachment   or  execution  and  immunity  from  the
      jurisdiction of any court or arbitral tribunal.

14.   EXPORT  CONTROL.  The parties  hereto  acknowledge  that to the extent any
      products,  software or technical information provided under this Agreement
      are or may be subject to any applicable  export laws and regulations,  the
      parties  hereto  agree  that they will not use,  distribute,  transfer  or
      transmit  the  products,   software  or  technical  information  (even  if
      incorporated  into other  products)  except in compliance with such export
      laws and regulations (or licenses or orders issued pursuant  thereto).  If
      requested  by  either  party  hereto  the other  party  agrees to sign all
      necessary export related documents as may be required to comply therewith.

15.   REPRESENTATIONS; INDEMNITY.

      A.    LEVEL 3. Level 3 hereby  represents  and warrants to Viatel that (i)
            each Level 3 entity is a corporation organized, validly existing and
            in  good  standing  under  the  laws  of  the  jurisdiction  of  its
            organization;  (ii) the execution,  delivery and performance of this
            Agreement  by  Level 3 has been  duly  authorized  by all  necessary
            corporate  action  on the part of Level 3 and  this  Agreement  is a
            valid, binding and enforceable  obligation of Level 3 enforceable in
            accordance  with its terms;  and (iii) the  execution  delivery  and
            performance of this Agreement by Level 3 does not violate,  conflict
            with or constitute a breach of, the organizational  documents or any
            order,  decree or  judgment of any court,  tribunal or  governmental
            authority binding on Level 3.

      B.    VIATEL.  Viatel hereby  represents  and warrants to Level 3 that (i)
            Viatel is a corporation duly organized, validly existing and in good
            standing under the laws of its  jurisdiction of  organization;  (ii)
            the execution,  delivery and performance of this Agreement by Viatel
            has been duly  authorized by all necessary  corporate  action on the
            part  of  Viatel  and  this  Agreement  is  a  valid,   binding  and
            enforceable  obligation of Viatel enforceable in accordance with its
            terms;  and (iii) the  execution,  delivery and  performance of this
            Agreement by Viatel does not violate,  conflict with or constitute a
            breach  of, the  organizational  documents  or any order,  decree or
            judgment of any court, tribunal or governmental authority binding on
            Viatel.

                                       10
<PAGE>

      C.    GOVERNMENTAL   REQUIREMENTS   AND  COMPLIANCE.   Each  party  hereby
            represents  and  warrants to the other party that it has obtained or
            will obtain all approvals,  consents,  governmental  authorizations,
            licenses  and  permits  as  may  be  required  to  enter  into  this
            Agreement,  and grant or acquire, as the case may be, the IRU in the
            Purchased Capacity and Fibers.  Each party agrees to comply with all
            applicable laws, rules and regulations  respecting the execution and
            performance of this Agreement.

      D.    SURVIVAL. The representations and warranties in this Agreement shall
            survive the execution and delivery of this Agreement.

      E.    VIOLATIONS BY VIATEL.  Subject to the  limitations  of liability set
            forth  in this  Agreement,  Viatel  agrees  to  indemnify  and  hold
            harmless  Level  3  and  their   respective   officers,   directors,
            employees,  agents and  representatives  from and  against any loss,
            damage,  expense or cost arising out of or in connection  with:  (i)
            any breach or violation by Viatel of applicable law or  governmental
            regulation or  nonpayment  of taxes payable by Viatel;  and (ii) any
            claims of  whatever  nature by third  parties  with  respect  to the
            services provided by Viatel.

      F.    VIOLATIONS BY LEVEL 3. Subject to the  limitations  of liability set
            forth  in this  Agreement,  Level 3  agrees  to  indemnify  and hold
            harmless Viatel and its officers,  directors,  employees, agents and
            representatives  from and against any loss, damage,  expense or cost
            arising out of or in connection with: (i) any breach or violation by
            Level 3 of applicable law or  governmental  regulation or nonpayment
            of taxes payable by Level 3; and (ii) any claims of whatever  nature
            by third parties with respect to the services provided by Level 3.

16.   RELATIONSHIP OF THE PARTIES. This Agreement shall not form a joint venture
      or partnership or similar business arrangement between the parties hereto,
      and nothing  contained  herein shall be deemed to constitute a partnership
      or joint venture or similar business arrangement.

17.   NO THIRD PARTY  BENEFICIARIES.  This Agreement does not provide and is not
      intended  to  provide  third  parties  (including,  but  not  limited  to,
      customers of Viatel,  any permitted  transferee of the Purchased  Capacity
      and  Fibers or any other  permitted  user of the  Purchased  Capacity  and
      Fibers) with any remedy, claim, liability, reimbursement, cause of action,
      or any other  right.  Furthermore,  Viatel  acknowledges  that it is not a
      third  party  beneficiary  of  any  agreement  entered  into  by  Level  3
      including, but not limited to, the System Agreements.

18.   ASSIGNMENT.

      A.    LIMITATIONS.  This Agreement and all of the provisions  hereof shall
            be binding  upon and inure to the benefit of the parties  hereto and
            their respective  successors and permitted  assigns;  provided that,
            except as provided in  paragraphs B and C of this  Section,  neither
            this  Agreement  nor any of the  rights,  interests  or  obligations
            hereunder shall be assigned, transferred or otherwise disposed of or
            delegated by either party hereto  without the prior written  consent

                                       11
<PAGE>
            of  the  other  party,  which  consent  shall  not  be  unreasonably
            withheld.

      B.    PERMITTED  ASSIGNMENTS.  Each party shall be permitted,  without the
            consent of the other party, to assign, transfer or otherwise dispose
            of any or all of their rights  hereunder  and delegate any or all of
            their  obligations  hereunder  to any  present or future  affiliated
            entity of the  transferring  party,  or to an entity  controlled by,
            under the same control as, or controlling,  the transferring  party,
            or to an entity purchasing all or substantially all of the assets of
            such party, or to an entity into which the transferring party may be
            merged or consolidated.  The transferring party shall give the other
            parties  hereto  notice of any such  assignment,  transfer  or other
            disposition  or any such  delegation.  No such  transfer  by a party
            shall   release  or  discharge   such  party  from  its  duties  and
            obligations hereunder.

      C.    PERMITTED  TRANSFEREES.  Nothing  contained  herein  shall  prohibit
            either party from leasing, licensing or otherwise granting rights in
            fibers  or  capacity  to third  parties;  provided,  no such  lease,
            license or other grant of rights shall  release or discharge a party
            from its duties and obligations hereunder.

19.   NOTICES.

      A.    SERVICE. Whenever under the provisions of this Agreement it shall be
            necessary or desirable  for one party to serve any notice,  request,
            demand,  report or other  communication  on another party,  the same
            shall be in  writing  and shall be served  (i)  personally;  (ii) by
            independent,  reputable,  overnight  commercial carrier; or (iii) by
            facsimile  transmission (A) where the transmitting  party includes a
            cover  sheet  identifying  the name,  location  and  identity of the
            transmitting  party,  the phone number of transmitting  device,  the
            date of transmission and the number of pages transmitted  (including
            the cover  page),  (B) where the  transmitting  device or  receiving
            device  records  verification  of  receipt  and the date and time of
            transmission  receipt and the phone number of the other device,  and
            (C) where the  facsimile  transmission  is  immediately  followed by
            service of the original of the subject  item in the manner  provided
            in clause (i), or (ii) hereof; addressed as follows:

            1)    If to Level 3:
                  Level 3  International,  Inc.
                  66 Prescot Street
                  London  El  8HG
                  England
                  Attn:  Legal   Department
                  Fax No. 44-171-864-0391

                  With a copy to:
                  Level 3 International, Inc.
                  1025 Eldorado Blvd.
                  Broomfield, Colorado 80021

                                       12
<PAGE>

                  Attn: General Counsel
                  Fax No. 720-888-5127

            2)    If to Viatel:
                  Viatel, Inc.
                  685 Third Avenue
                  New York, New York 10017
                  Attn: GENERAL COUNSEL
                  Fax No. 212-350-9245

      B.    CHANGE/DELIVERY.  Any party  may,  from  time to time,  by notice in
            writing  served  upon the other  party as  aforesaid,  designate  an
            additional  and/or a  different  mailing  address  or an  additional
            and/or  a  different  person  to whom all  such  notices,  requests,
            demands,  reports and communications are thereafter to be addressed.
            Any notice,  request,  demand,  report or other communication served
            personally  shall be deemed  delivered upon receipt,  if received by
            independent courier shall be deemed delivered on the date of receipt
            as shown by the addressee's registry or certification  receipt or on
            the date receipt at the appropriate address, as shown on the records
            or manifest of the independent  courier,  and if served by facsimile
            transmission  shall be deemed  delivered  on the date of  receipt as
            shown on the received facsimile (provided the original is thereafter
            delivered as aforesaid).

20.   WAIVER.

      A.    NON-WAIVER. No waiver by any party of any right or remedy under this
            Agreement  shall be deemed to be a waiver of any other or subsequent
            right or remedy  under this  Agreement.  The consent by one party to
            any act by the  other  party  requiring  such  consent  shall not be
            deemed  to  render  unnecessary  the  obtaining  of  consent  to any
            subsequent act for which consent is required,  regardless of whether
            similar to the act for which consent is given.

      B.    WRITING.  No waiver  of any  term,  covenant  or  condition  of this
            Agreement shall be valid unless in writing and signed by the obligee
            party.

      C.    LIMITED.  The acceptance of any payment or  reimbursement by a party
            shall not waive any preceding or then-existing  breach or default by
            the  other  party  of  any  term,  covenant  or  condition  of  this
            Agreement,  other than the other  party's  prior  failure to pay the
            particular  amount or part  thereof so accepted,  regardless  of the
            paid party's knowledge of such preceding or then-existing  breach or
            default at the time of acceptance of such payment or reimbursement.

21.   SEVERABILITY.  If any provision of this Agreement is found by an arbitral,
      judicial  or  regulatory  authority  having  jurisdiction  to be  void  or
      unenforceable,  such  provision  shall be deemed to be  deleted  from this
      Agreement and the remaining  provisions  shall  continue in full force and
      effect.

                                       13
<PAGE>

22.   HEADINGS.  The Section  headings of this Agreement are for  convenience of
      reference  only and are not intended to restrict,  affect or influence the
      interpretation or construction of provisions of such Section.

23.   COUNTERPARTS.  This  Agreement  may be executed in  counterparts,  each of
      which  when  executed  and  delivered  shall be deemed an  original.  Such
      counterparts shall together (as well as separately) constitute one and the
      same instrument.

24.   ENTIRE  AGREEMENT.  This Agreement  together with all  attachments  hereto
      supersedes  all prior oral or written  understandings  between the parties
      hereto and  constitutes  the entire  agreement with respect to the subject
      matter herein. This Agreement shall not be modified or amended except by a
      writing signed by authorized representatives of the parties hereto.

25.   PUBLICITY AND CONFIDENTIALITY.  The parties agree to be bound be the terms
      of a Non-Disclosure  Agreement  between their respective  affiliates dated
      17th November  1999,  the  continuing  efficacy of which,  its terms being
      unmodified herein, is hereby ratified and confirmed by the parties.

                                       14
<PAGE>

            IN  WITNESS  WHEREOF,  the  parties  have  executed  this  Agreement
effective on the date first written above.

                                       LEVEL 3 LANDING STATION INC.

                                       By  /S/ Thomas C. Stortz
                                           --------------------
                                           Name:  Thomas C. Stortz
                                           Title: Vice President and Secretary

                                       LEVEL 3 COMMUNICATIONS LIMITED

                                       By  /S/ Thomas C. Stortz
                                           --------------------
                                           Name:  Thomas C. Stortz
                                           Title: Director

                                       LEVEL 3 (BERMUDA) LIMITED

                                       By  /S/ Thomas C. Stortz
                                           --------------------
                                           Name:  Thomas C. Stortz
                                           Title:  Vice President

                                       VIATEL, INC.

                                       By  /S/ Michael J. Mahoney
                                           --------------------
                                           Name:  Michael J. Mahoney
                                           Title: Chief Executive Officer

                                       15
<PAGE>

                                  EXHIBIT "A"

                   Technical Specification for AC-1 Capacity

                                   [REDACTED]

<PAGE>

                                  EXHIBIT "B"

                              FIBER SPECIFICATIONS

                                   [REDACTED]June 16, 2000

Transaction Systems Architects, Inc.
330 South 108th Avenue
Omaha, Nebraska  68154-2684

Attention:        Mr. Edward Fuxa
                  Controller

Dear Mr. Fuxa:

Pursuant to our recent discussions, Norwest Bank Nebraska, N.A., (hereinafter
referred to as the "Bank"), is pleased to offer a secured, committed credit
facility jointly to Transaction Systems Architects, Inc., a Delaware
corporation ("TSA") and ACI Worldwide Inc., a Nebraska corporation  ("ACI")
(hereinafter referred to individually and collectively as the "Joint
Borrowers").

The terms of the facility set forth in this Letter Agreement (hereinafter
referred to as the "Facility Letter") are:

1)     Amount:                 The aggregate amount outstanding shall not
                               exceed Twenty Five Million and 00/100 United
                               States Dollars (USD) ($25,000,000.00)
                               (hereinafter referred to as the "Credit
                               Facility Amount") at any time, which shall be
                               available to the Joint Borrowers in the form of
                               loans (hereinafter referred to as "Advance(s)")
                               or standby letters of credit (hereinafter
                               referred to as "SLC(s)"), subject to a sublimit
                               of Ten Million and 00/100 United States Dollars
                               (USD) ($10,000,000.00) in the aggregate on
                               outstanding SLCs, including any Reimbursement
                               Obligations, as hereafter defined.

2)     Purpose:                General corporate purposes, provided that the
                               Joint Borrowers will not use the proceeds of
                               any Advances or SLCs extended or issued under
                               this facility for the purpose of purchasing or
                               carrying "margin stock" as defined in
                               Regulation U of the Board of Governors of the
                               Federal Reserve System.

3)     Evidence of
          Indebtedness:        A Promissory Note in the form of Exhibit A
                               hereto to be signed by the Joint Borrowers
                               (hereinafter referred to as the "Note").  The
                               indebtedness shall be the joint and several
                               obligation of TSA and ACI.

4)     Expiration Date:        This facility shall expire on May 31, 2001,
                               upon which date the total unpaid principal
                               balance, all accrued but unpaid interest and
                               any outstanding Reimbursement Obligations, as
                               hereafter defined, shall be paid in full.

5)     Interest Rate:          The unpaid principal balance of all Advances
                               hereunder shall bear interest as follows:

                               (a)  Base Rate: Before maturity of this credit
                                    facility, and except for  LIBOR Rate
                                    Advances, as hereafter defined, at an
                                    annual rate equal to 0.75% below the Base
                                    Rate adjusted at the time of changes in
                                    the Base Rate.  "Base Rate" shall mean the
                                    rate of interest established by Norwest
                                    Bank Nebraska, N.A. from time to time as
                                    its "base" or "prime" or "Norwest Money
                                    Market Rate."  Interest shall be paid
                                    monthly at the end of each month on any
                                    Advances made at the Base Rate.  Advances
                                    made at the Base Rate shall be made in the
                                    minimum principal amount of $10,000.

                               (b)  LIBOR Rate: LIBOR Rate is the rate at
                                    which deposits in U.S. dollars in the
                                    amount and for a maturity corresponding to
                                    that of any Advances made at the LIBOR
                                    Rate ("LIBOR Rate Advances") are offered
                                    to the Bank in the offshore inter-bank
                                    market at approximately 10:00 a.m.,
                                    (London, England time), two business days
                                    prior to the date on which such Advance is
                                    made, adjusted for maximum statutory
                                    reserve requirements, plus 175 basis
                                    points (1.75%) per annum.

                                    LIBOR Rate Advances shall be for periods,
                                    at the Joint Borrowers' option, of one
                                    (1), two (2) or three (3) months (each, an
                                    "Interest Period"); provided, that the
                                    Interest Period shall not extend beyond
                                    the Expiration Date.  Interest shall be
                                    payable at the maturity of each Interest
                                    Period and shall be calculated on actual
                                    days elapsed on a 360 day year.

                                    With respect to the renewal of any LIBOR
                                    Rate Advance, or any new borrowing
                                    hereunder, in the event that deposits in
                                    the amount and for the term of the
                                    selected Interest Period are unavailable
                                    to Bank, or that by reason or
                                    circumstances affecting the inter-bank
                                    markets generally, adequate and reasonable
                                    means do not exist for ascertaining the
                                    interest rate applicable to such LIBOR
                                    Rate Advance for the selected Interest
                                    Period, Joint Borrowers shall either repay
                                    such LIBOR Rate Advance or direct Bank to
                                    convert such LIBOR Rate Advance into an
                                    Advance of a type which is available on
                                    the last day of the then current Interest
                                    Period, said choice between repayment or
                                    conversion to be solely at Joint
                                    Borrowers' option.

                                    If it shall become unlawful (or contrary
                                    to any direction from or requirement of
                                    any governmental authority having
                                    jurisdiction over Bank) for Bank to
                                    continue to fund or maintain any LIBOR
                                    Rate Advance or to perform its obligations
                                    hereunder, then upon demand by Bank to
                                    Joint Borrowers, such LIBOR Rate Advance
                                    or other obligation shall thereupon be
                                    canceled, and, if it is unlawful for Bank
                                    to continue to fund or maintain any LIBOR
                                    Rate Advance, Joint Borrowers shall prepay
                                    such LIBOR Rate Advance without premium or
                                    penalty, together with accrued interest
                                    thereon, on the last day of the then
                                    current Interest Period or on such earlier
                                    date as may be required by law.

                                    The Joint Borrowers may obtain multiple
                                    LIBOR Rate Advances hereunder; provided,
                                    that each LIBOR Rate Advance shall be in
                                    the minimum principal amount of $1,000,000
                                    and shall be payable in full, with
                                    interest thereon, at the maturity of each
                                    LIBOR Rate Advance.

                               (c)  Default Rate: After maturity, whether by
                                    lapse of time, default, acceleration or
                                    otherwise, at a rate equal to the Base
                                    Rate plus three percent (3%) per annum
                                    (the "Default Rate").

6)     Request for
         Advances:             Requests for Advances by the Joint Borrowers
                               shall be made by telephonic, telecopier or
                               telex notice to the Bank (which notice shall be
                               promptly confirmed in writing) by Dwight G.
                               Hanson, Chief Financial Officer, Edward Fuxa,
                               Controller, or Frances Stein, General Manager,
                               Account Operations, all of TSA, or such other
                               person or persons subsequently designated by
                               the Joint Borrowers in writing.  Each request
                               by Joint Borrowers for an Advance at the Base
                               Rate must be received by the Bank no later than
                               12:00 p.m. Omaha, Nebraska time, on the day on
                               which it is to be funded.  Each request by
                               Joint Borrowers for a LIBOR Rate Advance must
                               be received by the Bank no later than 11:00
                               a.m. Omaha, Nebraska time, on the day which is
                               three (3) business days prior to the day on
                               which it is to be funded.  The Joint Borrowers
                               agree that the Bank may rely on any such
                               telephonic, telecopier or telex notice given by
                               any person it in good faith believes is
                               authorized to give such notice without the
                               necessity of independent investigation, and in
                               the event any notice by such means conflicts
                               with the written confirmation, such notice
                               shall govern if the Bank has acted in reliance
                               thereon.

7)     Prepayment:             The principal balance of the LIBOR Rate
                               Advances may not be prepaid, in whole or in
                               part, before the end of any Interest Period.
                               If, for any reason, a LIBOR Rate Advance is
                               paid prior to the last business day of any
                               Interest Period, the Joint Borrowers agree to
                               indemnify the Bank against any loss (including
                               any loss on redeployment of the funds repaid),
                               cost or expense incurred by the Bank as a
                               result of such prepayment.

8)     Standby Letters
         of Credit:            Each SLC shall be issued pursuant to an
                               Application for Letter of Credit in form and
                               substance satisfactory to the Bank.  The
                               expiration date of each SLC shall be on or
                               before the Expiration Date of this facility.
                               Upon the issuance of each SLC, Joint Borrowers
                               shall pay the Bank a commission fee in the
                               amount of one and three-quarters percent
                               (1.75%) on the amount of each SLC issued
                               hereunder plus the Bank's issuance costs.

                               Joint Borrowers are obligated, and hereby
                               unconditionally agree, to pay to the Bank, in
                               immediately available funds, the face amount of
                               each draft drawn and presented under an SLC
                               issued by the Bank hereunder (the obligation of
                               the Joint Borrowers hereunder with respect to
                               drafts drawn on any SLC is a "Reimbursement
                               Obligation").  If at any time the Joint
                               Borrowers fail to pay any Reimbursement
                               Obligation when due, the Joint Borrowers shall
                               be deemed to have requested an Advance from the
                               Bank hereunder at the Base Rate, as of the date
                               such Reimbursement Obligation is due, the
                               proceeds of which Advance shall be used to
                               repay such Reimbursement Obligation.  Such
                               Advance shall only be made if no Event of
                               Default shall exist and shall be subject to
                               availability under the Credit Facility Amount.
                               If such Advance is not made by the Bank for any
                               reason, the unpaid amount of such Reimbursement
                               Obligation shall be due and payable to the Bank
                               upon demand and shall bear interest at the
                               Default Rate of interest specified herein.

9)     Commitment Fee:         In consideration for the Bank making this
                               facility available to the Joint Borrowers, the
                               Joint Borrowers agree to pay to the Bank a
                               commitment fee of 25 basis points per annum of
                               the Credit Facility Amount, payable at closing.

10)    Non-Use Fee:            In consideration for the Bank making this
                               facility available to the Joint Borrowers, the
                               Joint Borrowers agree to pay to the Bank a
                               non-use fee on the average unused portion of
                               the Credit Facility Amount during each quarter
                               of 25 basis points per annum, payable quarterly
                               in arrears on each March 31, June 30, September
                               30, December 31 and on the Expiration Date.

11)    Guarantors:             Applied Communications, Inc. U.K. Holding
                               Company, Regency Systems, Inc. and IntraNet,
                               Inc. (individually and collectively the
                               "Guarantors") shall execute and deliver to the
                               Bank, "Guaranties," in form and substance
                               acceptable to the Bank.  The Guaranties shall
                               provide the Bank with an absolute,
                               unconditional and unlimited guarantee of
                               payment of the Obligations, as hereafter
                               defined, by each of the Guarantors.  Regency
                               Systems, Inc. and IntraNet, Inc. (collectively
                               the "Domestic Guarantors") shall further
                               provide the Bank a security interest in all of
                               their accounts, as more fully set forth in the
                               following section.

12)    Security:               As security for the payment of the Note
                               executed in connection herewith (including any
                               and all extensions, renewals, modifications and
                               substitutions thereof, or exchanges therefore),
                               any and all future advances of credit to the
                               Joint Borrowers the performance of this
                               Facility Letter, the payment of any and all
                               amounts advanced by the Bank hereunder or
                               otherwise on behalf of the Joint Borrowers, any
                               legal fees and all other fees, charges,
                               expenses, or costs incurred by the Bank in
                               connection herewith, and for the satisfaction
                               of any and all other liabilities or obligations
                               of the Joint Borrowers to the Bank, howsoever
                               created, direct or indirect, absolute or
                               contingent, joint or several, now or hereafter
                               existing, or due or to become due (herein
                               collectively called the "Obligations"), the
                               Joint Borrowers and the Domestic Guarantors
                               have executed and delivered to the Bank, or
                               will execute and deliver to the Bank, Security
                               Agreements and Financing Statements granting
                               the Bank a security interest and first lien on
                               all accounts of the Joint Borrowers and the
                               Domestic Guarantors.

                               Joint Borrowers previously executed and
                               delivered Security Agreements to the Bank dated
                               June 8, 1995.  The Joint Borrowers hereby
                               reaffirm the security interest granted to the
                               Bank pursuant to said Security Agreements, and
                               agree that the security interests granted
                               thereby shall continue with respect to the
                               Obligations.

                               Joint Borrowers hereby agree to execute and
                               deliver on demand and hereby irrevocably
                               constitute and appoint the Bank the attorney-in
                               fact-of the Joint Borrowers coupled with an
                               interest, to execute, deliver, and if
                               appropriate, to file with the appropriate
                               filing officer or office such security
                               agreements, financing statements or other
                               instruments as the Bank may request or require
                               in order to impose or perfect the lien or
                               security interests hereof more specifically
                               thereon.

                               The executed Security Agreements and Financing
                               Statements are collectively and individually
                               referred to as the "Security Documents."

13)    Indemnity:              The Joint Borrowers hereby agree to indemnify the
                               Bank against any loss (including any loss on
                               redeployment of the funds prepaid), cost or
                               expense incurred by the Bank as a result of
                               default or acceleration of the Note, including
                               all court costs, reasonable attorneys' fees and
                               other costs of collection.

14)    Representations:        (a)   The Joint Borrowers are duly organized
                                     and existing under the laws of their
                                     respective states of incorporation, have
                                     full and adequate corporate powers to
                                     carry on their respective businesses as
                                     now conducted, are duly licensed or
                                     qualified in all jurisdictions wherein
                                     the nature of their respective activities
                                     require such licensing or qualifying, and
                                     where a failure to so qualify would have
                                     a material adverse effect on the
                                     Borrower, have full right, power and
                                     authority to enter into and perform this
                                     Facility Letter, the Note, Security
                                     Documents, and entering into and
                                     performing this Facility Letter, the
                                     Note, and Security Documents has been
                                     authorized by all necessary corporate
                                     action and does not contravene any
                                     provision of any charter or bylaw
                                     provision or any covenant, indenture or
                                     agreement of or affecting the Joint
                                     Borrowers, or any of their properties.

                               (b)   The Joint Borrowers have heretofore
                                     delivered to the Bank a copy of TSA's:
                                     (i) Annual Report on Form 10-K for the
                                     fiscal year ended as of September 30,
                                     1999; (ii) Quarterly Report on Form 10-Q
                                     for the quarterly period ended December
                                     31, 1999; and (iii) Quarterly Report on
                                     Form 10-Q for the quarterly period ended
                                     March 31, 2000 (the "TSA Reports").  The
                                     financial statements contained in the TSA
                                     Reports were prepared on a consolidated
                                     basis in accordance with generally
                                     accepted accounting principles on a basis
                                     consistent with that of the previous
                                     fiscal year or period, except where
                                     otherwise noted in the financial
                                     statements, and fairly reflects the
                                     financial position of the Joint Borrowers
                                     as of the date thereof, and the results
                                     of their respective operations for the
                                     period covered thereby.  The Joint
                                     Borrowers do not have any significant
                                     known contingent liabilities other than
                                     as indicated on said financial statements
                                     and since said date of March 31, 2000,
                                     there has been no material adverse change
                                     in the condition, financial or otherwise,
                                     of the Joint Borrowers.

                               (c)   There is no material litigation or
                                     administrative or governmental
                                     proceedings pending, nor to the knowledge
                                     of the Joint Borrowers threatened against
                                     the Joint Borrowers, which, if adversely
                                     determined, would result in any material
                                     adverse change in the properties,
                                     business or operations of the Joint
                                     Borrowers.  All federal, state and local
                                     income tax returns for the Joint
                                     Borrowers required to be filed have been
                                     filed on a timely basis, and all amounts
                                     required to be paid as shown by said
                                     returns have been paid.  There are no
                                     material pending, or to the best of the
                                     Joint Borrowers' knowledge, threatened
                                     objections to or controversies in respect
                                     of the federal, state and local income
                                     tax returns of the Joint Borrowers for
                                     any fiscal year.  No authorization,
                                     consent, license, exemption or filing or
                                     registration with any court or
                                     governmental department, agency or
                                     instrumentality is or will be necessary
                                     to the valid execution, delivery or
                                     performance by the Joint Borrowers of
                                     this Facility Letter, the Note and
                                     Security Documents.

                               (d)   Joint Borrowers are in full compliance
                                     with all of the terms and conditions of
                                     this Facility Letter, and no Event of
                                     Default, as hereafter defined, is
                                     existing under this Facility Letter.

                               (e)   The Joint Borrowers are  in compliance in
                                     all material respects with ERISA, as
                                     hereafter defined, to the extent
                                     applicable to it, except for any
                                     noncompliance which could not reasonably
                                     be expected to result in any material
                                     adverse change in the properties,
                                     business, or operations of the Joint
                                     Borrowers, and have received no notice to
                                     the contrary from the PBGC, as hereafter
                                     defined, or any other governmental entity
                                     or agency.

                               (f)   No information, exhibit or report
                                     prepared by the Joint Borrowers and
                                     furnished to the Bank in connection with
                                     the negotiation of the Facility Letter
                                     contained any material misstatement of
                                     fact or omitted to state a material fact
                                     or any fact necessary to make the
                                     statements contained therein not
                                     misleading in light of the circumstances
                                     in which made.

                               (g)   This Facility Letter, the Note and
                                     Security Documents, when executed and
                                     delivered by the Joint Borrowers
                                     hereunder, will constitute the legal,
                                     valid and binding obligation of the Joint
                                     Borrowers enforceable against the Joint
                                     Borrowers in accordance with their
                                     respective terms.

                               (h)   To the best of the Joint Borrowers'
                                     knowledge, following reasonable inquiry,
                                     the Joint Borrowers do not have any
                                     material liability, contingent or
                                     otherwise, arising under any applicable
                                     federal or state environmental health and
                                     safety statutes and regulations.

                               (i)   The provisions of the Security
                                     Agreements, as provided herein, are
                                     effective to create in favor of the Bank,
                                     legal, valid and enforceable liens on all
                                     of the "accounts," as defined in the
                                     Security Agreements, of the Joint Debtors
                                     and the Domestic Guarantors.  Financing
                                     Statements filed with the Secretary of
                                     State of Nebraska naming each of the
                                     Joint Borrowers as the "Debtor" shall
                                     constitute fully perfected first security
                                     interests and liens on all right, title
                                     and interest of the Joint Borrowers and
                                     the Domestic Guarantors in the accounts
                                     of the Joint Debtors and Domestic
                                     Guarantors described therein, prior and
                                     superior to all other liens.

                               (j)   The principal place of business and chief
                                     executive offices of TSA and ACI are
                                     located in Omaha, Nebraska.  The
                                     principal place of business and chief
                                     executive office of Regency Systems, Inc.
                                     are located in Dallas, Texas.  The
                                     principal place of business and chief
                                     executive office of IntraNet, Inc. are
                                     located in Newton, Massachusetts.

                               (k)   Except for a portion of their receivables
                                     which are factored from time to time in
                                     the ordinary course of business, none of
                                     the assets of the Joint Borrowers are
                                     subject to any mortgage, pledge, title
                                     retention lien, or other lien,
                                     encumbrance or security interest, except
                                     for:  (a) current taxes not delinquent or
                                     taxes being contested as provided by law
                                     in good faith and by appropriate legal
                                     proceedings; (b) liens arising in the
                                     ordinary course of business for sums not
                                     due or sums being contested in good faith
                                     and by appropriate legal proceedings, but
                                     not involving any deposits or advances of
                                     borrowed money or the deferred purchase
                                     price of property or services; and (c) to
                                     the extent specifically shown in the
                                     financial statement referred to above.
                                     The Bank acknowledges (i) that the Joint
                                     Borrowers and Domestic Guarantors have
                                     previously factored a portion of their
                                     receivables, (ii) that the Joint
                                     Borrowers and Domestic Guarantors will
                                     factor a portion of their receivables in
                                     the future, and (iii) that the foregoing
                                     actions will not constitute a breach of
                                     any representation, covenant or other
                                     provision of this Facility Letter;
                                     provided that the Joint Borrowers shall
                                     be in compliance with the covenant
                                     requiring a minimum balance of eligible
                                     receivables both before and after any
                                     such factoring of $35,000,000, as set
                                     forth in Section 15(j).

                               (l)   The Joint Borrowers are not parties to
                                     any agreement or instrument, or subject
                                     to any charter or other corporate
                                     restriction, nor are they subject to any
                                     judgment, decree or order of any court or
                                     governmental body, which Joint Borrowers
                                     know or reasonably should know may have a
                                     material and adverse effect on the
                                     business, assets, liabilities, financial
                                     condition, operations or obligations
                                     under this Facility Letter or the Note or
                                     Security Documents.  Joint Borrowers have
                                     no, nor with reasonable diligence should
                                     have had, knowledge of or notice that
                                     they are in default on the performance,
                                     observance or fulfillment of any of the
                                     obligations, covenants or conditions
                                     contained in any agreement, instrument,
                                     charter or other corporate restriction,
                                     judgment, decree or order of any court or
                                     governmental body that might have a
                                     material adverse impact on the Joint
                                     Borrowers.

                               (m)   Except in the ordinary course of
                                     business, the Joint Borrowers have not
                                     sold, conveyed, transferred, disposed of,
                                     or otherwise further encumbered, any
                                     material amount of the Joint Borrowers'
                                     assets within the last ninety (90) days.
                                     The Bank acknowledges that the Joint
                                     Borrowers factor a portion of their
                                     receivables in the ordinary course of
                                     business.

                               (n)   The amounts to be received by Bank as
                                     interest payments under the Note shall
                                     constitute lawful interest and shall be
                                     neither usurious nor illegal under the
                                     laws of the State of Nebraska.

                               (o)   The best of their knowledge, Joint
                                     Borrowers:  (a) are not in violation of
                                     any federal, state or county governmental
                                     rule, regulation or ordinance; or (b)
                                     have not failed to obtain any license,
                                     permit, franchise or other governmental
                                     authorization necessary to the ownership
                                     of Joint Borrowers' respective properties
                                     or the conduct of their businesses; which
                                     violation or failure (in the event that
                                     such violation or failure were asserted
                                     by any person or entity by appropriate
                                     action) would result in a material
                                     impediment to the conduct of the Joint
                                     Borrowers' regular business.

                               (p)   None of the Joint Borrowers are an
                                     "investment company" or a company
                                     "controlled" by an "investment company"
                                     within the meaning of the Investment
                                     Company Act of 1940, as amended.

15)    Covenants:              (a)   The  Joint Borrowers shall preserve and
                                     maintain their respective corporate
                                     existence and shall keep in force and
                                     effect all licenses, permits and
                                     franchises necessary and material to the
                                     proper conduct of their respective
                                     businesses.  The Joint Borrowers shall
                                     maintain, preserve and keep their
                                     respective property, plant and equipment,
                                     including, without limitation, all
                                     tangible and intangible assets, in good
                                     repair, working order and condition.

                               (b)   The Joint Borrowers shall duly pay and
                                     discharge all material taxes,
                                     assessments, fees and governmental
                                     charges upon them or any of their
                                     properties before the same become
                                     delinquent, except to the extent that
                                     they are being contested in good faith by
                                     appropriate proceedings and adequate
                                     reserves are provided therefor.

                               (c)   The Joint Borrowers shall maintain a
                                     standard accounting system in accordance
                                     with generally accepted accounting
                                     principles ("GAAP") and shall furnish to
                                     the Bank the following:

                                     (i)    as soon as available and in any
                                            event within 45 days after the end
                                            of each fiscal quarter, the
                                            consolidated and consolidating
                                            balance sheet of the Joint
                                            Borrowers and their subsidiaries,
                                            consolidated and consolidating
                                            statements of income, retained
                                            earnings and cash flows of the
                                            Joint Borrowers and their
                                            subsidiaries for such fiscal
                                            quarter, prepared in accordance
                                            with GAAP and certified as
                                            accurate by the chief financial
                                            officer of the Joint Borrowers,
                                            together with related 10-Q filings
                                            made with the Securities and
                                            Exchange Commission;

                                     (ii)   as soon as available and in any
                                            event within 90 days after the end
                                            of each fiscal year, the
                                            consolidated and consolidating
                                            balance sheet of the Joint
                                            Borrowers and their subsidiaries,
                                            consolidated and consolidating
                                            statements of income, retained
                                            earnings and cash flows of the
                                            Joint Borrowers and their
                                            subsidiaries for such fiscal year,
                                            accompanied by an unqualified
                                            opinion prepared by independent
                                            public accountants of recognized
                                            national standing, in accordance
                                            with GAAP, together with related
                                            10-K filings made with the
                                            Securities and Exchange
                                            Commission;;

                                     (iii)  Each of the financial statements
                                            furnished to the Bank pursuant to
                                            paragraphs 15 (c) (i) and (ii)
                                            above shall be accompanied by a
                                            written compliance certificate of
                                            the Joint Borrowers signed by
                                            TSA's chief financial officer: (1)
                                            to the effect that the signer
                                            thereof has reviewed the terms and
                                            provisions of this Facility Letter
                                            and that no Event of Default has
                                            occurred during the period covered
                                            by such statements or if any such
                                            Event of Default has occurred
                                            during such period, setting forth
                                            a description of such Event of
                                            Default and specifying the action,
                                            if any, taken by the Joint
                                            Borrowers to remedy the same; and
                                            (2) setting forth the information
                                            and computations (in sufficient
                                            detail) required to establish
                                            whether the Joint Borrowers were
                                            in compliance with the financial
                                            requirements and covenants set
                                            forth herein during the period
                                            covered by the financial
                                            statements then being furnished;

                                     (iv)   Promptly upon obtaining knowledge
                                            of the existence thereof, the
                                            Joint Borrowers shall give written
                                            notice of the occurrence of any
                                            Event of Default hereunder
                                            together with a detailed statement
                                            by a responsible officer of the
                                            Joint Borrowers of the steps being
                                            taken by the Joint Borrowers to
                                            cure any such Event of Default;

                                     (v)    Immediately upon the occurrence of
                                            a default, breach or event of
                                            default under any note or any
                                            other evidence of indebtedness of
                                            the Joint Borrowers in excess of
                                            $1,000,000, or upon becoming aware
                                            that the holder of any such note
                                            or other evidence of indebtedness
                                            has given or threatened to give
                                            notice or taken any other action
                                            with respect to a claim of
                                            default, breach or event of
                                            default under such evidence of
                                            indebtedness, the Joint Borrowers
                                            shall give the Bank notice
                                            describing the action taken, the
                                            nature of the actual or claimed
                                            default and the period of
                                            existence thereof, together with a
                                            detailed statement by an officer
                                            of the Joint Borrowers of the
                                            steps being taken by the Joint
                                            Borrowers to cure the actual or
                                            claimed default; and

                                     (vi)   Immediately after the commencement
                                            thereof, notice in writing of all
                                            litigation and of all proceedings
                                            before any governmental or
                                            regulatory agency affecting the
                                            Joint Borrowers, or which seek a
                                            monetary recovery for uninsured
                                            claims against the Joint Borrowers
                                            in excess of $1,000,000, or
                                            $2,000,000 for claims subject to
                                            Employment Practice Liability
                                            insurance.

                               (d)   The Joint Borrowers shall not, either
                                     directly or indirectly, be a party to any
                                     merger or consolidation, nor sell,
                                     transfer, lease, encumber or otherwise
                                     dispose of all or any substantial part of
                                     their respective property or business or
                                     all or any substantial part of their
                                     respective assets other than in the
                                     ordinary course of business.  The term
                                     "substantial," as used herein shall mean
                                     25% of the Joint Borrowers' Tangible Net
                                     Worth at the close of the most recent
                                     fiscal year.

                               (e)   The Joint Borrowers shall comply in all
                                     material respects with the requirements
                                     of all federal, state and local laws,
                                     rules, regulations, ordinances and orders
                                     applicable to the Joint Borrowers or
                                     their respective properties or business
                                     operations, the non-compliance with which
                                     could have a material adverse effect on
                                     the financial condition, properties or
                                     business of the Joint Borrowers.

                               (f)   Without the prior written consent of the
                                     Bank, and until all Advances hereunder
                                     are paid in full, all SLCs issued by the
                                     Bank have expired, and all Reimbursement
                                     Obligations are paid in full, and the
                                     Bank has no remaining obligation to issue
                                     SLCs or to make further Advances to the
                                     Joint Borrowers, Joint Borrowers shall
                                     not incur indebtedness for borrowed money
                                     except unsecured loans not to exceed
                                     $7,000,000 in the aggregate outstanding
                                     at any time.  This covenant shall not
                                     apply to purchase money indebtedness or
                                     capital lease obligations incurred by the
                                     Joint Debtors in the ordinary course of
                                     business.

                               (g)   Until all Advances hereunder are paid in
                                     full, all SLCs issued by the Bank have
                                     expired, and all Reimbursement
                                     Obligations are paid in full and the Bank
                                     has no remaining obligation to issue SLCs
                                     or to make further Advances to the Joint
                                     Borrowers, the Joint Borrowers agree not
                                     to create, assume, incur or suffer or
                                     permit to exist any mortgage, pledge,
                                     encumbrance, security interest,
                                     assignment, lien or charge of any kind or
                                     character upon any asset of the Joint
                                     Borrowers whether owned at the date
                                     hereof or hereafter acquired except:

                                     (A)    liens for taxes, assessments or
                                            other governmental charges not yet
                                            due or which are being contested
                                            in good faith by appropriate
                                            proceedings;

                                     (B)    other liens, charges and
                                            encumbrances incidental to the
                                            conduct of its business or the
                                            ownership of its property which
                                            were not incurred in connection
                                            with the borrowing of money or the
                                            obtaining of an advance of credit,
                                            and which do not in the aggregate
                                            materially detract from the net
                                            value of their property or assets
                                            or materially impair the use
                                            thereof in the operation of their
                                            respective businesses;

                                     (C)    liens arising out of judgments or
                                            awards with respect to which the
                                            Joint Borrowers shall concurrently
                                            therewith be prosecuting an appeal
                                            or proceedings for review and with
                                            respect to which they shall have
                                            secured a stay of execution
                                            pending such appeal or review;

                                     (D)    pledges or deposits to secure
                                            obligations under workmen's
                                            compensation laws or similar
                                            legislation;

                                     (E)    deposits to secure public or
                                            statutory obligations of the Joint
                                            Borrowers; and

                                     (F)    liens granted in the ordinary
                                            course of business for purchase
                                            money security interests and
                                            capital leases.

                               (h)   The Joint Borrowers shall maintain a
                                     consolidated Minimum Tangible Net Worth
                                     according to the following schedule:

                                     $132,000,000.00 as of June 30, 2000;

                                     $137,000,000.00 as of September 30, 2000;

                                     $142,000,000.00 as of December 31, 2000;

                                     $147,000,000.00 as of March 31, 2001.

                                     For purposes of this covenant, "Tangible
                                     Net Worth" shall mean the stockholders'
                                     equity, minus the amount of all
                                     intangibles, and excluding "accumulated
                                     other comprehensive income," all as
                                     determined in accordance with GAAP.

                               (i)   The Joint Borrowers shall maintain a
                                     consolidated Minimum Working Capital of
                                     Fifty Million and 00/100 United States
                                     Dollars (USD) ($50,000,000.00) at all
                                     times.  For purposes hereof, "Working
                                     Capital" shall mean the difference
                                     between total  current assets and total
                                     current liabilities, as shown on a
                                     balance sheet prepared in accordance with
                                     GAAP.

                               (j)   The Joint Borrowers shall maintain a
                                     balance of eligible accounts receivable
                                     (accounts receivable that remain unpaid
                                     120 days or less after the date of
                                     invoice) at all times of not less than
                                     Thirty Five Million and No/100 United
                                     States Dollars (USD) ($35,000,000.00) in
                                     the aggregate.

                               (k)   The Joint Borrowers will maintain
                                     insurance coverage by good and
                                     responsible insurance underwriters in
                                     such forms and amounts and against such
                                     risks and hazards as are customary for
                                     companies engaged in similar businesses
                                     and owning and operating similar
                                     properties.

                               (l)   The Joint Borrowers will promptly pay and
                                     discharge all obligations and liabilities
                                     arising under the Employee Retirement
                                     Income Security Act of 1974, as amended
                                     ("ERISA"), of a character which if unpaid
                                     or unperformed might result in the
                                     imposition of a lien against its
                                     properties and assets and will promptly
                                     notify the Bank of (i) the occurrence of
                                     any reportable event (as defined in
                                     ERISA) which might result in the
                                     termination by the Pension Benefit
                                     Guaranty Corporation ("PBGC") of any
                                     employee benefit plan covering any
                                     officers or employees of the Joint
                                     Borrowers, any benefits of which are or
                                     are required to be guaranteed by PBGC
                                     ("Plan"), (ii) receipt of any notice from
                                     PBGC of its intention to seek termination
                                     of such Plan or appointment of a trustee
                                     therefor, and (iii) its intention to
                                     terminate or withdraw from any Plan.  The
                                     Joint Borrowers will not terminate any
                                     such Plan or withdraw therefrom unless it
                                     shall be in compliance with all of the
                                     terms and conditions of this Facility
                                     Letter after giving effect to any
                                     liability to PBGC resulting from such
                                     termination or withdrawal.

                               (m)   The Joint Borrowers shall comply in all
                                     material respects with the requirements
                                     of all federal, state and local pollution
                                     laws, regulations, and orders applicable
                                     to or pertaining to its properties and
                                     business operations of the Joint
                                     Borrowers.

                               (n)   For purposes of this covenant, the
                                     management of Joint Borrowers includes
                                     and is limited to William E. Fisher,
                                     Chief Executive Officer and Chairman of
                                     the Board, David C. Russell, President,
                                     and Dwight G. Hanson, Chief Financial
                                     Officer, all of TSA, and Mark R. Vipond,
                                     Chief Operating Officer of ACI.  Joint
                                     Borrowers shall not change the management
                                     of Joint Borrowers without the Bank's
                                     prior written consent, except for
                                     terminations for good cause related
                                     solely to the performance of their
                                     respective management responsibilities.

                               (o)   Joint Borrowers will permit the Bank or
                                     any officer, employee or agent of the
                                     Bank at any time during the Joint
                                     Borrowers' regular business hours to
                                     inspect their properties and to inspect
                                     and copy their books and records,
                                     including, without limitation, accounts
                                     receivable records.  The Bank shall also
                                     be entitled, at its expense, to have an
                                     independent audit of Joint Borrowers'
                                     books and records.

                               (p)   Joint Borrowers shall not change the
                                     location of their chief executive offices
                                     and principal place of business from
                                     Omaha, Nebraska, unless Joint Borrowers
                                     shall give the Bank at least sixty (60)
                                     days prior written notice thereof and all
                                     actions necessary or advisable in the
                                     Bank's opinion to protect the Bank's liens
                                     covered by the Security Documents have
                                     been taken.

                               (q)   ITI - Initial Public Offering: On behalf
                                     of its subsidiary, Insession
                                     Technologies, Inc. ("ITI"), TSA has
                                     caused a Registration Statement on Form
                                     S-1 to be filed with the SEC for the
                                     purpose of completing an initial public
                                     offering of the stock of ITI and,
                                     thereafter, subject to receipt of
                                     appropriate IRS letter ruling or other
                                     tax approvals or opinions, TSA intends to
                                     distribute all of the remaining shares of
                                     ITI held by TSA to TSA's shareholders
                                     (the "IPO A Distribution").   In
                                     connection with the IPO A Distribution,
                                     TSA plans to transfer, or cause one or
                                     more of its subsidiaries to transfer, to
                                     ITI certain assets, liabilities and
                                     equity interests, all as described in the
                                     S-1 Registration Statement.  The Joint
                                     Borrowers covenant and agree that they
                                     shall not transfer, or cause or permit to
                                     be transferred, to ITI any assets,
                                     liabilities or equity interests unless
                                     and until (i) Joint Borrowers notify the
                                     Bank thereof in writing, and (ii) ITI
                                     agrees in writing, in form and substance
                                     acceptable to the Bank, to become
                                     obligated to pay $9,000,000 of the
                                     indebtedness due or to become due on the
                                     Note, plus related interest, fees and
                                     expenses, and to provide the Bank with a
                                     security interest in its accounts, all
                                     upon terms and conditions consistent in
                                     all material respects with this Facility
                                     Letter; and provided that the Joint
                                     Borrowers shall remain liable for the
                                     entire Credit Facility Amount.

16)    Default:                The Joint Borrowers, without notice or demand
                               of any kind, shall be in default under this
                               Facility Letter upon the occurrence of any of
                               the following events (each an "Event of
                               Default").

                               (a)   Any amount due and owing on the Note or
                                     on any Reimbursement Obligation or any
                                     other obligation owed by the Joint
                                     Borrowers hereunder, whether by its terms
                                     or as otherwise provided herein, or any
                                     obligation owed by the Joint Borrowers
                                     under the Security Documents, is not paid
                                     when due.

                               (b)   Any written warranty, representation,
                                     certificate or statement herein or any
                                     other written agreement with the Bank
                                     shall be false when made.

                               (c)   Any failure to perform or default in the
                                     performance of any covenant, condition or
                                     agreement contained herein, in the
                                     Security Documents or in any other
                                     written agreement with the Bank.

                               (d)   The Joint Borrowers makes an assignment
                                     for the benefit of creditors, fails to
                                     pay, or admits in writing its inability
                                     to pay its debts as they mature; or if a
                                     trustee of any substantial part of the
                                     assets of the Joint Borrowers is applied
                                     for or appointed, and in the case of such
                                     trustee being appointed in a proceeding
                                     brought against the Joint Borrowers, the
                                     Joint Borrowers , by any action or
                                     failure to act indicates their approval
                                     of, consent to, or acquiescence in such
                                     appointment and such appointment is not
                                     vacated, stayed on appeal or otherwise
                                     shall not have ceased to continue in
                                     effect within 60 days after the date of
                                     such appointment.

                               (e)   Any proceeding involving the Joint
                                     Borrowers is commenced under any
                                     bankruptcy, reorganization, arrangement,
                                     insolvency, readjustment of debt,
                                     dissolution or liquidation law or statute
                                     of the federal government or any state
                                     government, and in the case of any such
                                     proceeding being instituted against the
                                     Joint Borrowers, (i) the Joint Borrowers,
                                     by any action or failure to act indicate
                                     their approval of, consent to or
                                     acquiescence therein, or (ii) an order
                                     shall be entered approving the petition
                                     in such proceedings and such order is not
                                     vacated, stayed on appeal or otherwise
                                     shall not have ceased to continue in
                                     effect within 60 days after the entry
                                     thereof.

                               (f)   The entry of any judgment, decree, levy,
                                     attachment, garnishment or other process,
                                     in excess of $1,000,000, or the filing of
                                     any lien against the Joint Borrowers
                                     which is not covered by insurance and
                                     such judgment, decree, levy, attachment,
                                     garnishment, lien or other process shall
                                     not have been vacated, discharged or
                                     stayed pending appeal within thirty (30)
                                     days from the entry thereof.

                               (g)   If a default exists and the Joint
                                     Borrowers are notified of a default (or,
                                     if no such declaration or notification
                                     exists, a default occurs which is of the
                                     type which allows such party to declare
                                     the outstanding amounts immediately due
                                     and payable without prior declaration of
                                     notice to Joint Borrowers) in the payment
                                     or performance by Joint Borrowers of any
                                     agreement in excess of $1,000,000, or
                                     agreements in excess of $5,000,000 in the
                                     aggregate, between the Joint Borrowers
                                     and any party other than the Bank
                                     evidencing the borrowing of money or a
                                     guaranty, the effect of which default is
                                     to cause or permit the holder of such
                                     obligation(s) to cause such obligation(s)
                                     to become due prior to its stated
                                     maturity.

                               (h)   The acquisition by any person or entity,
                                     or two or more persons or entities acting
                                     in concert, of beneficial ownership
                                     (within the meaning of Rule 13d-3 of the
                                     Securities and Exchange Commission under
                                     the Securities Exchange Act of 1934) of
                                     20% or more of the outstanding shares of
                                     voting stock of the Joint Borrowers.

                               (i)   Any default by the Guarantors under the
                                     terms of the Guaranties, or under the
                                     terms of the Security Agreements given by
                                     the Domestic Guarantors.

                               (j)   There shall occur or exist any facts
                                     which lead the Bank to believe in good
                                     faith that Joint Borrowers will not, or
                                     will be unable to, pay, in the normal
                                     course, any of the Obligations.

17)    Remedies                (a)   Non-bankruptcy Defaults.  When any Event of
                                     Default described in subsection (a)
                                     through (c), (f), (g), or (h) of Section
                                     16 has occurred and is continuing, the
                                     Bank may, by notice to the Joint
                                     Borrowers, take one or more of the
                                     following actions:

                                     (i)    terminate the obligation of the
                                            Bank, to extend any further credit
                                            hereunder on the date (which may
                                            be the date thereof) stated in
                                            such notice;

                                     (ii)   declare the principal of and the
                                            accrued interest on the Note to be
                                            forthwith due and payable and
                                            thereupon the Note, including both
                                            principal and interest and all
                                            fees, charges and other
                                            obligations payable hereunder and
                                            under any other document executed
                                            between the Joint Borrowers and
                                            the Bank, shall be and become
                                            immediately due and payable
                                            without further demand,
                                            presentment, protest or notice of
                                            any kind; and

                                     (iii)  enforce any and all rights and
                                            remedies available to it under any
                                            other document executed between
                                            the Joint Borrowers and the Bank
                                            or under applicable law.
                               (b)   Bankruptcy Defaults.  When any Event of
                                     Default described in subsection (d) or
                                     (e) of Section 16 has occurred and is
                                     continuing, then the Note, including both
                                     principal and interest, and all fees,
                                     charges and other obligations payable
                                     hereunder and thereunder, shall
                                     immediately become due and payable
                                     without presentment, demand, protest or
                                     notice of any kind, and the obligation of
                                     the Bank to extend further credit
                                     pursuant to any of the terms hereof shall
                                     immediately terminate.  In addition, the
                                     Bank may exercise any and all remedies
                                     available to it under any other document
                                     executed between the Joint Borrowers and
                                     the Bank or applicable law.

18)    Miscellaneous:          (a)   At the date of this Facility Letter and
                                     any Advance or issuance of an SLC, the
                                     Joint Borrowers' representations and
                                     warranties set forth herein shall be true
                                     and correct as at such date with the same
                                     effect as though those representations
                                     and warranties had been made on and as at
                                     such date.

                               (b)   At the time of this Facility Letter and
                                     any Advance or issuance of an SLC the
                                     Joint Borrowers shall be in compliance
                                     with all the terms and provisions set
                                     forth herein on their part to be observed
                                     or performed, and no Event of Default
                                     shall have occurred and be continuing at
                                     the time of an Advance or issuance of an
                                     SLC or would result from the making of an
                                     Advance or issuance of an SLC or any
                                     subsequent Advances or issuance of SLCs.

                               (c)   The request by the Joint Borrowers for
                                     any Advance or the issuance of any SLCs,
                                     shall be deemed a representation and
                                     warranty by the Joint Borrowers that the
                                     representations contained herein are true
                                     and correct on and as of the date of each
                                     such request for an Advance or the
                                     issuance of an SLC and that the Joint
                                     Borrowers are in compliance with all
                                     covenants set forth herein.

                               (d)   The Bank may, by written notice to the
                                     Joint Borrowers, at any time and from
                                     time to time, waive any default in the
                                     performance or observance of any
                                     condition, covenant or other term hereof,
                                     which shall be for such period and
                                     subject to such conditions as shall be
                                     specified in any such notice.  In the
                                     case of any such waiver, the Bank and the
                                     Joint Borrowers shall be restored to
                                     their former position and rights
                                     hereunder and under the Note, and any
                                     Event of Default so waived shall be
                                     deemed to be cured and not continuing;
                                     but no such waiver shall affect, extend
                                     or impair any rights of the Bank with
                                     respect to any default, except as
                                     specifically set forth in the Bank's
                                     written notice, nor shall it affect
                                     Bank's rights with respect to any
                                     subsequent or other Event of Default.

                               (e)   No failure to exercise, and no delay in
                                     exercising, on the part of the Bank of
                                     any right, power or privilege hereunder
                                     shall preclude any other or further
                                     exercise thereof or the exercise of any
                                     other right, power or privilege.  The
                                     rights and remedies of the Bank herein
                                     provided are cumulative and not exclusive
                                     of any rights or remedies provided by law.

                               (f)   All agreements, representations and
                                     warranties made herein shall survive the
                                     delivery of this Facility Letter, the
                                     Note and the Security Documents and the
                                     making of any loans or advances.

                               (g)   From time to time, the Joint Borrowers
                                     will execute and deliver to the Bank such
                                     additional documents, and will provide
                                     such additional information as the Bank
                                     may reasonably require to carry out the
                                     terms of this Facility Letter and be
                                     informed of the Joint Borrowers' status
                                     and affairs.

                               (h)   This Facility Letter, the Note and
                                     Security Documents and any document or
                                     instrument or other agreement executed in
                                     connection herewith and except as
                                     otherwise specifically provided therein
                                     shall be governed by, and construed and
                                     interpreted in accordance with, the
                                     internal laws of the State of Nebraska,
                                     and shall be deemed to have been executed
                                     in the State of Nebraska.

                               (i)   This Facility Letter constitutes the
                                     entire understanding between the parties
                                     hereto with respect to the subject matter
                                     hereof, superseding all prior written or
                                     oral understandings, and may not be
                                     modified, amended or terminated except by
                                     a written agreement signed by each of the
                                     parties hereto or thereto.
                                     Notwithstanding the foregoing, the
                                     provisions of this Facility Letter are
                                     not intended to supersede the provisions
                                     of the Note or Security Documents, but
                                     shall be construed as supplemental
                                     thereto.

                               (j)   If any term or provision of this Facility
                                     Letter, or the Note or Security
                                     Documents, or any document or instrument
                                     executed in connection therewith,
                                     including amendments and modifications or
                                     the application thereof to any person or
                                     circumstance shall to any extent be
                                     invalid or unenforceable, the terms and
                                     provisions or the application of such
                                     term or provision to person or
                                     circumstances other than those as to which
                                     it is held invalid or unenforceable shall
                                     not be affected thereby, and each form
                                     and provision shall be valid or enforced
                                     to the fullest extent possible by law.

                               (k)   The Bank shall have sole discretion
                                     regarding the application of any payments
                                     or proceeds received from the Joint
                                     Borrowers and the Guarantors, voluntary
                                     or involuntary, including, without
                                     limitation, any proceeds from the sale or
                                     other disposition of any of the
                                     collateral or security described herein.

19)    Credit Agreement
       Notice                  A credit agreement must be in writing to be
                               enforceable under Nebraska law.  To protect you
                               and us from any misunderstandings or
                               disappointments, any contract, promise,
                               undertaking, or offer to forebear repayment of
                               money or to make any other financial
                               accommodation in connection with this loan of
                               money or grant or extension of credit, or any
                               amendment of, cancellation of, waiver of, or
                               substitution for any or all of the terms or
                               provisions of any instrument or document
                               executed in connection with this loan of money
                               or grant or extension of credit must be in
                               writing to be effective.

The Joint Borrowers understand and agree that this facility is not assignable
by the Joint Borrowers.  Bank reserves the right to sell assignments and
participations in this facility.

We trust that the foregoing adequately sets forth the terms and conditions
with respect to this facility.  If you are in agreement with the above, please
execute and return the enclosed Note, Security Documents, Guaranties  and a
copy of this Facility Letter.  This facility shall be effective when you have
signed and returned all of such items to us.  The offer to establish a
facility which is evidenced by the Bank's delivery of a copy of this letter to
the Joint Borrowers will expire at 5:00 p.m., Central Daylight Time, on June
16, 2000, unless on or prior to such time the Bank shall have received a copy
of this letter signed by the Joint Borrowers.  Prior to borrowing under this
facility the Joint Borrowers and Guarantors will supply the Bank with
satisfactory corporate resolutions and incumbency certificates.

Sincerely,

Bill Weber
Vice President
Corporate Banking

Acknowledged and Agreed
as of June 16, 2000

TRANSACTION SYSTEMS ARCHITECTS, INC.

By:/s/ Dwight G. Hanson

Title:  Chief Financial Officer

By:__________________________

Title:_______________________

ACI WORLDWIDE INC.

By:/s/ Dwight G. Hanson

Title:  Chief Financial Officer

By:__________________________

Title:_______________________

                                PROMISSORY NOTE

USD $25,000,000.00                               Dated: June 16, 2000

         TRANSACTION SYSTEMS ARCHITECTS, INC. and ACI WORLDWIDE INC. (the
"Joint Borrowers"), jointly and severally, for value received, promise to pay
to the order of Norwest Bank Nebraska, N.A. (the "Bank"), in lawful money of
the United States at the principal office of the Bank in Omaha, Nebraska, or
as the Bank may otherwise direct, the lesser of the principal sum of
Twenty-Five Million and 00/100 United States Dollars or the principal amount
outstanding, if any, under the letter agreement dated June 16, 2000, between
the Joint Borrowers and the Bank (the "Facility Letter"), with interest
(computed on actual days elapsed on the basis of a 360 day year) on the
principal amount outstanding hereunder as hereinafter set forth, together with
all costs of collection, including reasonable attorneys' fees, upon default.

         The unpaid principal balance of all loans ("Advances") hereunder
shall bear interest as follows:

                  (a)      Base Rate: Before maturity of this Note,
         and except for  LIBOR Rate Advances, as hereafter defined,
         at an annual rate equal to 0.75% below the Base Rate
         adjusted at the time of changes in the Base Rate.  "Base
         Rate" shall mean the rate of interest established by Norwest
         Bank Nebraska, N.A. from time to time as its "base" or
         "prime" or "Norwest Money Market Rate."  Interest shall be
         paid monthly at the end of each month on any Advances made
         at the Base Rate.  Advances made at the Base Rate shall be
         made in the minimum principal amount of $10,000.

                  (b)      LIBOR Rate: LIBOR Rate is the rate at
         which deposits in U.S. dollars in the amount and for a
         maturity corresponding to that of any Advances made at the
         LIBOR Rate ("LIBOR Rate Advances") are offered to the Bank
         in the offshore inter-bank market at approximately 10:00
         a.m., (London, England time), two business days prior to the
         date on which such LIBOR Rate Advance is made, adjusted for
         maximum statutory reserve requirements, plus 175 basis
         points (1.75%) per annum.

                  LIBOR Rate Advances shall be for periods, at the
         Joint Borrowers' option, of one (1), two (2) or three (3)
         months (each, an "Interest Period"); provided, that the
         Interest Period shall not extend beyond the Expiration
         Date.  Interest shall be payable at the maturity of each
         Interest Period and shall be calculated on actual days
         elapsed on a 360 day year.

                  With respect to the renewal of any LIBOR Rate
         Advance, or any new borrowing hereunder, in the event that
         deposits in the amount and for the term of the selected
         Interest Period are unavailable to Bank, or that by reason
         or circumstances affecting the inter-bank markets generally,
         adequate and reasonable means do not exist for ascertaining
         the interest rate applicable to such LIBOR Rate Advance for
         the selected Interest Period, Joint Borrowers shall either
         repay such LIBOR Rate Advance or direct Bank to convert such
         LIBOR Rate Advance into an Advance of a type which is
         available on the last day of the then current Interest
         Period, said choice between repayment or conversion to be
         solely at Joint Borrowers' option.

                  If it shall become unlawful (or contrary to any
         direction from or requirement of any governmental authority
         having jurisdiction over Bank) for Bank to continue to fund
         or maintain any LIBOR Rate Advance or to perform its
         obligations hereunder, then upon demand by Bank to Joint
         Borrowers, such LIBOR Rate Advance or other obligation shall
         thereupon be canceled and, if it is unlawful for Bank to
         continue to fund or maintain any LIBOR Rate Advance, Joint
         Borrowers shall prepay such LIBOR Rate Advance without
         premium or penalty, together with accrued interest thereon,
         on the last day of the then current Interest Period or on
         such earlier date as may be required by law.

                  The Joint Borrowers may obtain multiple LIBOR Rate
         Advances hereunder; provided, that each LIBOR Rate Advance
         shall be in the minimum principal amount of $1,000,000 and
         shall be payable in full, with interest thereon, at the
         maturity of each LIBOR Rate Advance.

                  (c)      Default Rate: After maturity, whether by
         lapse of time, default, acceleration or otherwise, at a rate
         equal to the Base Rate plus three percent (3%) per annum
         (the "Default Rate").

                  Requests for Advances by the Joint Borrowers shall
         be made by telephonic, telecopier or telex notice to the
         Bank (which notice shall be promptly confirmed in writing)
         by Dwight G. Hanson, Chief Financial Officer, Edward Fuxa,
         Controller, or Frances Stein, General Manager, Account
         Operations, all of TSA, or such other person or persons
         subsequently designated by the Joint Borrowers in writing.
         Each request by Joint Borrowers for an Advance at the Base
         Rate must be received by the Bank no later than 12:00 p.m.
         Omaha, Nebraska time, on the day on which it is to be
         funded.  Each request by Joint Borrowers for a LIBOR Rate
         Advance must be received by the Bank no later than 11:00
         a.m. Omaha, Nebraska time, on the day which is three (3)
         business days prior to the day on which it is to be funded.
         The Joint Borrowers agree that the Bank may rely on any such
         telephonic, telecopier or telex notice given by any person
         it in good faith believes is authorized to give such notice
         without the necessity of independent investigation, and in
         the event any notice by such means conflicts with the
         written confirmation, such notice shall govern if the Bank
         has acted in reliance thereon.

                  The principal balance of the LIBOR Rate Advances
         may not be prepaid, in whole or in part, before the end of
         any Interest Period.  If, for any reason, a LIBOR Rate
         Advance is paid prior to the last business day of any
         Interest Period, the Joint Borrowers agree to indemnify the
         Bank against any loss (including any loss on redeployment of
         the funds repaid), cost or expense incurred by the Bank as a
         result of such prepayment.

                  The total unpaid principal balance and all accrued
         but unpaid interest on this Note shall be due and payable at
         maturity on May 31, 2001 (the "Expiration Date").

         The Bank, on the occurrence of any Event of Default under the Facility
Letter may, without notice, appropriate and apply toward the payment of the
outstanding balance of the Note, if not paid when due, or toward the payment
of outstanding sums due to the Bank under the Facility Letter, any
indebtedness of the Bank to the Joint Borrowers howsoever created or arising,
including, without limitation, any and all balances, credits, deposits,
accounts or monies of the Joint Borrowers.

         All amounts outstanding under this Note shall become immediately due
and payable at the option of the Bank, without any demand or notice
whatsoever, in the event that (i) the Joint Borrowers shall fail to make any
payment when due of principal or interest on this Note or on any other
obligation of the Joint Borrowers to the Bank or (ii) any other Event of
Default shall occur under the Facility Letter.  In addition, this and all
other obligations of the Joint Borrowers to the Bank shall be and become due
and payable immediately without any demand or notice whatsoever:  (a) in the
event of any assignment for the benefit of creditors of the Joint Borrowers,
or the commencement of any bankruptcy, receivership, insolvency
reorganization, or liquidation proceedings by or against the Joint Borrowers;
or (b) the event of any garnishment, attachment, levy or lien being asserted
against any deposit balance maintained (or any property deposited) by the
Joint Borrowers with the Bank.

         All Advances made by the Bank and all payments made by the Joint
Borrowers hereunder shall be recorded on the books and records of the Bank.
The Joint Borrowers agree that in any action or proceeding instituted to
collect or enforce collection of this Note, the amount endorsed on the
Schedule attached to this Note at that time or inscribed in such other records
of the Bank shall be prima-facie evidence of the unpaid principal balance of
this Note.

         If any payment to be made by the Joint Borrowers hereunder shall
become due on a Saturday, Sunday or business holiday under Federal law or the
laws of the State of Nebraska, such payment shall be made on the next
succeeding business day and such extension of time shall be included in
computing any interest in respect of such payment.

         If any change in any law, rule, regulation or directive (including,
without limitation, Regulation D of the Board of Governors of the Federal
Reserve System) imposes any condition the result of which is to increase the
cost to the Bank of making, funding or maintaining any LIBOR Rate Advance or
reduces any amount receivable by the Bank hereunder in connection with a LIBOR
Rate Advance, the Joint Borrowers shall pay the Bank the amount of such
increased expense incurred or the reduction in any amount received which the
Bank determines is attributable to making, funding and maintaining the LIBOR
Rate Advances.

         The Bank may elect to sell participations in or assign its rights
under Advances.  The Joint Borrowers agree that if they fail to pay any
Advance when due, any purchaser of an interest in such Advance shall be
entitled to seek enforcement of this Note if the purchaser is permitted to do
so pursuant to the terms of the participation agreement between the Bank and
such purchaser.

         The Joint Borrowers hereby authorize the Bank and any other holder of
an interest in this Note (a "holder") to disclose confidential information
relating to the financial condition or operations of the Joint Borrowers (i)
to any affiliate of the Bank or any holder, (ii) to any purchaser or
prospective purchaser of an interest in any Advance, (iii) to legal counsel,
accountants, and other professional advisors to the Bank or any holder, (iv)
to regulatory officials, (v) as requested or required by law, regulation, or
legal process or (vi) in connection with any legal proceeding to which the
Bank or any other holder is a party.

         (A)      in the case of disclosures pursuant to (i), (ii) and (iii)
                  above, the Bank shall have first received from each such
                  disclosee, a written agreement to maintain such confidential
                  information in strict confidence and;

         (B)      in the case of disclosures pursuant to (iv), (v) an (vi)
                  above, the Bank shall have given TSA reasonable notice so as
                  to afford TSA an opportunity to secure protection of the
                  confidential information.

         The Joint Borrowers hereby indemnify the Bank against any loss
(including any loss on redeployment of funds prepaid), cost or expense
incurred by the Bank as a result of a default hereunder or under the Facility
Letter or acceleration of this Note and all Advances evidenced hereby,
including, without limitation, all court costs, reasonable attorneys' fees and
other costs of collection.

         This Note is executed in conjunction with the Facility Letter and is
subject to all of the terms and conditions contained therein.  THIS NOTE SHALL
BE GOVERNED BY THE INTERNAL LAW (AND NOT THE LAW OF CONFLICTS) OF THE STATE OF
NEBRASKA, GIVING EFFECT, HOWEVER, TO FEDERAL LAWS APPLICABLE TO NATIONAL
BANKS. THE JOINT BORROWERS AND THE BANK EACH HEREBY WAIVE TRIAL BY JURY IN ANY
JUDICIAL PROCEEDING INVOLVING, DIRECTLY OR INDIRECTLY, ANY MATTER (WHETHER
SOUNDING IN TORT, CONTRACT OR OTHERWISE) IN ANY WAY ARISING OUT OF RELATED TO,
OR CONNECTED WITH THIS NOTE OR THE RELATIONSHIP ESTABLISHED HEREUNDER.

TRANSACTION SYSTEMS ARCHITECTS, INC.

By:/s/ Dwight G. Hanson

Its:

By:

Its:

ACI WORLDWIDE INC.

By:/s/ Dwight G. Hanson

Its:

By:

Its:

                                    SCHEDULE

                       to be attached and become a part of
                       the Promissory Note dated June 16,
                      2000 executed by Transaction Systems
                     Architects Inc. and ACI Worldwide Inc.
                       as "Joint Borrowers" and payable to
                           Norwest Bank Nebraska, N.A.

                                                       Unpaid     Initials
                                 Amount               Principal      of
    Date     Amount                of                  Balance     Person
     of        of               Interest   Principal     of        Making
Transaction   Loan   Maturity     Rate      Payment     Note      Notation
-----------   ----   --------     ----      -------     ----      --------

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