Document:

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                                                                      APPENDIX A

                               VICOM, INCORPORATED

                           CERTIFICATE OF DESIGNATION
                                     OF THE
                  RELATIVE RIGHTS, RESTRICTIONS AND PREFERENCES
                                       OF
                    10% CLASS C CUMULATIVE CONVERTIBLE STOCK

     Pursuant to Section 302A.401 of the Minnesota Business Corporations Act
                          -----------------------------

         The undersigned, as the Chief Executive Officer of Vicom, Incorporated,
a Minnesota corporation (the "Corporation"), hereby certifies that on the 14th
day of June, 2000, the following resolutions were adopted by the Board of
Directors of the Corporation for the purpose of designating a portion of the
Corporation's authorized but unissued capital stock as Preferred Stock and
establishing a third class of Preferred Stock designated as "10% Class C
Cumulative Convertible Preferred Stock":

         "RESOLVED, that pursuant to authority granted to and vested in the
Board of Directors by the laws of the State of Minnesota and the Corporation's
Articles of Incorporation, as amended and restated, the Board of Directors
hereby establishes the following classes of capital stock:

         A.       Two Hundred Fifty Thousand (250,000) shares of the
                  Corporation's authorized but authorized but unissued capital
                  stock shall be Preferred Stock, with no par value per share,
                  designated as "10% Class C Cumulative Convertible Preferred
                  Stock";

         B.       The remaining balance of the Corporation's authorized but
                  unissued capital stock shall be undesignated as to class or
                  series.

         FURTHER RESOLVED, that the 10% Class C Cumulative Convertible Preferred
         Stock shall have the relative right, restrictions and preferences set
         forth in APPENDIX A attached hereto."

         IN WITNESS WHEREOF, I have hereunder subscriber my name this 14th day
         of June, 2000.

                                                --------------------------------
                                                James L. Mandel
                                                Chief Executive Officer

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                               VICOM, INCORPORATED

               10% CLASS C CUMULATIVE CONVERTIBLE PREFERRED STOCK

         The total number of shares of all classes of capital stock which the
Corporation is authorized to issue is Fifty Million (50,000,000). The shares of
capital stock of the Corporation shall include a class of preferred stock
consisting of Two Hundred Seventy-five Thousand (275,000) shares, which shall be
designated 8% Class A Cumulative Convertible Preferred Stock with no par value
per share ("Class A Preferred"), and a second class of preferred stock
consisting of Sixty Thousand (60,000) shares, which shall be designated 10%
Class B Cumulative Convertible Preferred Stock with no par value per share
("Class B Preferred"), and a third class of Preferred Stock consisting of two
hundred fifty thousand (250,000) shares which shall be designated 10% Class C
Cumulative Convertible Preferred Stock. The balance of the Corporation's
authorized but unissued capital stock shall be undesignated capital stock. The
rights, preferences, privileges, restrictions and other matters relating to the
Class A Preferred Stock and Class B Preferred Stock are as follows:

         1.       DIVIDENDS. Holders of the Class C Preferred shall be entitled
         to receive, when and as declared by the Board of Directors out of funds
         legally available therefor, cumulative cash dividends at the rate set
         forth below in paragraph 1A. For purposes of calculating the dividends
         payable on the Class C Preferred, each share of Class C Preferred shall
         be valued at $10.00 per share approximately adjusted for stock
         dividends, stock splits, reverse stock splits, and other subdivisions
         and combinations of Class C Preferred (such per share price, as it may
         be adjusted, for the Class C Preferred is referred to herein as the
         "Dividend Price"). All dividends payable pursuant to this Section 1
         shall be referred to as "Preferred Dividends."

                           A.       CLASS C PREFERRED. The holders of shares of
                           Class A Preferred shall be entitled to receive, when
                           and as declared by the Board of Directors of the
                           Corporation out of assets of the Corporation legally
                           available for payment thereof, cumulative cash
                           dividends on the Dividend Price then in effect for
                           the Class A Preferred at the per annum rate, computed
                           on the basis of actual days over a 365-day year, of
                           ten percent (10%) per annum. Such dividends shall be
                           payable upon declaration quarterly on March 31, June
                           30, September 30 and December 31 of each year,
                           commencing for any share of Class A Preferred on the
                           first of such dates to occur after that share is
                           issued.

                           B.       ACCRUAL; PAYMENT. The Preferred Dividends on
                           the Class C Preferred shall accrue cumulatively on a
                           daily basis from and as of the date of original
                           issuance of the Class C Preferred until such time as
                           the Class C Preferred are redeemed or converted,
                           whether or not declared and whether or not any funds
                           of the Corporation are legally available for the
                           payment of dividends. Preferred Dividends shall be
                           payable to holders of record of the Class C Preferred
                           as they appear on the books of the Corporation on the
                           record date determined by the Board of Directors.
                           Preferred Dividends payable for the initial dividend
                           period shall be based on the amount of dividends
                           accrued since the date of issuance of the Class C
                           Preferred.

         2.       DIVIDEND PRIORITIES. No dividend payments shall be paid or
declared and set apart for payment on any other shares of stock of the
Corporation, whether common or preferred, for any period, and no other shares of
the Corporation, whether common or preferred, shall be redeemed or purchased by
the Corporation, unless all Preferred Dividends have been paid or

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contemporaneously are declared and paid on the Class C Preferred for such
period. Except as provided in Section1 above, holders of the Class C Preferred
shall not be entitled to any dividends, whether payable in cash, property or
stock, in excess of the full Preferred Dividends for any period. No interest, or
sum of money in lieu of interest, shall be payable in respect of any Preferred
Dividend payments or payment which may be in arrears. If at any time the
Corporation pays less than the total amount of the Preferred Dividends then
accrued with respect to the Class C Preferred, such payment shall be distributed
ratably among the holders of Class C Preferred based upon the aggregate accrued
but unpaid dividends on the shares of Class C Preferred held by each such holder
on the record date fixed by the Board of Directors for the payment of such
dividend. The Board of Directors, in its discretion, may declare and pay
dividends on the common stock or capital stock of the Corporation, provided that
all accumulated Preferred Dividends on the Class C Preferred for the current and
all previous dividend periods have been paid in full. In the event that, for a
given year, the dividends declared on the common stock of the Corporation
exceed, on a per share basis, the year to date per share Preferred Dividends
accrued, declared and paid on the Class C Preferred, the Class C Preferred shall
participate in and shall receive a pro rate share of the excess amount. Such
allocation shall be adjusted as appropriate to account for any change in the
capitalization of the Corporation occurring after the date hereof, whether
resulting from a recapitalization, stock dividend, stock split, reverse stock
split or otherwise.

         3.       LIQUIDATION PREFERENCES.

                  A.       Upon any liquidation, dissolution or winding up of
the Corporation, whether voluntary or involuntary, the holders of the shares of
Class C Preferred shall be entitled, after payment or provision for all debts
and liabilities of the Corporation and before any distribution or payment is
made upon any other shares of capital stock of the Corporation, to be paid an
amount per share equal to the sum of (i) $10.00 per share (appropriately
adjusted for stock dividends, stock splits, reverse stock splits, and other
subdivisions and combinations of Class C Preferred (such per share price, as
adjusted, for the Class C Preferred is referred to herein as the "Preferred
Price") plus (ii) accrued and unpaid Preferred Dividends due under Section 1
above. (Such total sum of the amounts payable referred to in clauses (i) and
(ii) being sometimes referred to herein as the "Preferential Amount".) If upon
such liquidation, dissolution or winding up of the Corporation, whether
voluntary or involuntary, the assets to be distributed among the holders of
Class C Preferred shall be insufficient to permit payment to the holders of
Class C Preferred of the amount distributable as aforesaid, then all of the
assets of the Corporation remaining to be so distributed ratably (a) first among
the holders of the shares of Class C Preferred so that the same percentage of
the Preferred Price for each share of Class C Preferred is paid with respect to
each such share, until the full amount of the Preferred Price has been paid; and
(b) then among the holders of the shares of Class C Preferred so that the same
percentage of the Preferred Dividends for each share of Class C Preferred is
paid with respect to each such share, until the full amount of the Preferred
Dividends has been paid.

                  B.       Upon any such liquidation, dissolution or winding up
of the Corporation, after the holders of Class C Preferred shall have been fully
paid in full the amounts to which they shall be entitled, the remaining net
assets of the Corporation may be distributed pro rate to the holders of shares
of common stock of the Corporation; provided that in the event that, upon
liquidation and dissolution of the Corporation, the amounts distributed to the
holders of the shares of common stock of the Corporation exceed, on a per share
basis, the amount of the Preferential Amount, the holders of the Class C
Preferred shall participate in and shall receive a pro rate share of the excess.

                  C.       Written notice of such liquidation, dissolution or
winding up, stating a payment date, the amount of the Preferential Amount and
the place where said Preferential Amount shall be payable, shall be delivered in
person, mailed by certified or registered mail, return receipt requested, or
sent by telecopier or telex, not less than twenty (20) business days prior to
the payment date stated therein, to the holders of record of Class C Preferred,
such notice to be addressed to each such holder at its address as shown by the
records of the Corporation. The

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consolidation or merger of the Corporation into or with any other securitie4s or
other consideration issued or paid or caused to be issued or paid by any such
entity or affiliate thereof, and the sale, lease, abandonment, transfer or other
disposition by the Corporation of all or substantially all its assets, shall be
deemed to be a liquidation, dissolution or winding up of the Corporation within
the meaning of the provisions of this Section

         4.       VOTING RIGHTS. The Class C Preferred are non-voting, except as
may otherwise be required by law.

         5.       CONVERSIONS. The holders of shares of Class C Preferred shall
have the following conversion rights:

                  A.       RIGHT TO CONVERT. Subject to the terms and conditions
of this Section 5, the holder of any share of shares of Class C Preferred shall
have the right, at his or her option at any time, to convert any such share or
shares of Class C Preferred (except that upon any liquidation of the Corporation
the right of conversion shall terminate at the close of business on the business
day prior to the date fixed for payment of the amount distributable on Class C
Preferred into two (2) fully paid and nonassessable shares of the Corporation's
common stock, no par value per share (the "Common Stock"), or, in case an
adjustment has taken place pursuant to the further provisions of this Section 5,
then by the conversion ratio as last adjusted and in effect at the date any
share of shares of Class C Preferred are surrendered for conversion (such ratio,
or such ratio as last adjusted, being referred to as the "Conversion Ratio").
Such rights of conversion shall be exercised by the holder thereof by giving
written notice that the holder elects to convert a stated number of shares of
Class C Preferred into Common Stock and by surrender of a certificate or
certificates for the shares so to be converted to the Corporation at its
principal office (or such other office or agency of the Corporation as the
Corporation may designate by notice in writing to the holders of Class C
Preferred) at any time during its usual business hours on the date set forth in
such notice, together with a statement of the name or names (with address) in
which the certificate or certificates for shares of Common Stock shall be
issued.

                  B.       ISSUANCE OF CERTIFICATES; TIME CONVERSION EFFECTED.
Promptly after the receipt of the written notice referred to in paragraph 5A and
surrender of the certificate or certificates for the share of shares of Class C
Preferred to be converted, the Corporation shall issue and deliver, or cause to
be issued and delivered, to the holder, registered in such name or names as such
holder may direct, a certificate or certificates for the number of whole shares
of Common Stock issuable upon the conversion of such share of shares of Class C
Preferred. The extent permitted by law, such conversion shall be deemed to have
been effected and the Conversion Ratio shall be determined as of the close of
business on the date on which such written notice shall been received by the
Corporation and the certificate or certificates for such share or shares shall
have been surrendered as aforesaid, and at such time the rights of the holder of
such share of shares of Class C Preferred shall cease, and the person or persons
in whose name or names any certificate for shares of Common Stock shall be
deemed to have become the holder and holders of record of the shares represented
thereby.

                  C.       FRACTIONAL SHARES; DIVIDENDS; PARTIAL CONVERSION. No
fractional shares shall be issued upon conversion of Class C Preferred into
Common Stock and no payment or adjustment shall be made upon any conversion on
account of any cash dividends on the Common Stock issued upon such conversion.
At the time of each conversion, the Corporation shall pay in cash an amount
equal to all dividends declared pursuant to Section 1 above and unpaid on the
shares of Class C Preferred surrendered for conversion to the date upon which
such conversion is deemed to take place as provided in paragraph 5B. In case the
number of shares of Class C Preferred represented by this certificate or
certificates surrendered pursuant to Paragraph 5A exceeds the number of shares
converted the Corporation shall, upon the conversion, execute and deliver to the
holder, at the expense of the Corporation, a new certificate of certificates for
the number of shares of Class C Preferred represented by the certificate or
certificates surrendered

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which are not to be converted. If any fractional share of Common Stock would,
except for the provisions of the first sentence of this paragraph 5C, be
delivered upon such conversion, the Corporation, in lieu of delivering such
fractional share, shall pay to the holder surrendering Class C Preferred for
conversion an amount in cash equal to the current market price of such
fractional share as determined in good faith by the Board of Directors of the
Corporation.

                  D.       STOCK DIVIDENDS; SUBDIVISION OR COMBINATION OF COMMON
STOCK. In case the Corporation shall, after the date on which the Class C
Preferred are first issued by the Corporation (the "Original Issue Date"), at
any time subdivide (by any stock split, stock dividend or otherwise) its
outstanding shares of Common Stock into a greater number of shares, the
Conversion Ratio in effect immediately prior to such subdivision shall be
proportionately increased, and, conversely, in case the outstanding shares of
Common Stock shall be combined into a smaller number of shares, the Conversion
Ratio in effect immediately prior to such combination shall be proportionately
reduced.

                  E.       REORGANIZATION OR RECLASSIFICATION. If any capital
reorganization or reclassification of the capital stock of the Corporation shall
be effected after the Original Issue Date in such a way that holders of Common
Stock shall be entitled to receive stock, securities or assets with respect to
or in exchange for Common Stock, then, as a condition of such reorganization or
reclassification, lawful and adequate provisions shall be made whereby each
holder of a share or shares of Class C Preferred shall thereupon have the right
to receive, upon the basis and upon the terms and conditions specified herein
and in lieu of the shares of Common Stock immediately theretofore receivable
upon the conversion of such share of shares of Class C Preferred, such shares of
stock, securities or assets as may be issued or payable with respect to or in
exchange for a number of outstanding share of such Common Stock equal to the
number of shares of such Common Stock immediately theretofore receivable upon
such conversion had such reorganization or reclassification not taken place, and
in any such case appropriate provisions shall be made with respect to the rights
and interest of such holder to that end that the provisions (including, without
limitation, provisions for adjustments of the Conversion Ratio) shall thereafter
be applicable, as nearly as may be, in relation to any shares of stock,
securities or assets thereafter deliverable upon the exercise of such conversion
rights.

                  F.       NOTICE OF ADJUSTMENT. Upon any adjustment of the
Conversion Ratio, then and in each such case the Corporation shall give written
notice thereof, by delivery in person, certified or registered mail, return
receipt requested, telecopier or telex, addressed to each holder of shares of
Class C Preferred at the address of such holder as shown on the books of the
Corporation, which notice shall state the Conversion Ratio resulting from such
adjustment, setting forth in reasonable detail the method upon which such
calculation is based.

                  G.       OTHER NOTICES. In case at any time:

                           (1)      the Corporation shall declare any dividend
                  upon its Common Stock payable in stock or make any other
                  distribution to the holders of its Common Stock;

                           (2)      the Corporation shall offer for subscription
                  pro rate to the holders of its Common Stock any additional
                  shares of stock of any class or other rights;

                           (3)      there shall by any capital reorganization or
                  reclassification of the capital stock of the Corporation, or a
                  consolidation merger of the Corporation with or into another
                  entity or entities, or a sale, lease, abandonment, transfer or
                  other disposition of all or substantially all its assets; or

                           (4)      there shall be a voluntary or involuntary
                  dissolution, liquidation or winding up of the Corporation;

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then, in any one or more of said cases, the Corporation shall give, by delivery
in person, certified or registered mail, return receipt requested, telecopier or
telex, addressed to each holder of any shares of Class C Preferred at the
address of such holder as shown on the books of the Corporation, (a) at least 20
days' prior written notice of the date on which the books of the Corporation
shall close or a record shall be taken for such dividend, distribution or
subscription righ5ts or for determining rights to vote in respect of any such
reorganization, reclassification, consolidation, merger, disposition,
dissolution, liquidation or winding up and (b) in the case of any such
reorganization, reclassification, consolidation, merger, disposition,
dissolution, liquidation or winding up, at least 20 days' prior written notice
of the date when the same shall take place. Such notice in accordance with the
foregoing clause (a) shall also specify, in the case of any such dividend,
distribution or subscription rights, the date on which the holders of Common
Stock shall be entitled thereto and such notice in accordance with the foregoing
clause (b) shall also specify the date on which the holders of Common Stock
shall be entitled to exchange their Common Stock for securities or other
property deliverable upon such reorganization, reclassification, consolidation,
merger, disposition, dissolution, liquidation or winding up, as the case may
be..

                  H.       STOCK TO BE RESERVED. The Corporation will at all
times reserve and keep available out of its authorized Common Stock, solely for
the purpose of issuance upon the conversion of Class C Preferred as herein
provided, such number of shares of Common Stock as shall then be issuable upon
the conversion of all outstanding shares of Class C Preferred. The Corporation
covenants that all shares of Common Stock which shall be so issued shall by duly
and validly issued and fully paid and non assessable and free from all transfer
taxes, liens and charges with respect to the issue thereof. The Corporation will
take all such action as may be necessary to assure that all such shares of
Common Stock may be so issued without violation of any applicable law or
regulation, of if any requirement of any national securities exchange upon which
the Common Stock may be listed.

                  I.       NO REISSUANCE OF CLASS A PREFERRED AND CLASS B
PREFERRED. Shares of Class C Preferred which are converted into shares of Common
Stock as provided herein shall not be reissued.

                  J.       ISSUE TAX. The issuance of certificates of shares of
Common Stock upon conversion of Class C Preferred shall be made without charge
to the holders thereof for any issuance tax in respect thereof, provided that
the Corporation shall not be required to pay any tax which may be payable in
respect of any transfer involved in the issuance and delivery of any certificate
in a name other than that of the holder of Class C Preferred which is being
converted.

                  K.       CLOSING OF BOOKS. Except as required by an
underwriter in connection with a public offering, the Corporation will at no
time close its transfer books against the transfer of any Class C Preferred or
of any shares of Common Stock issued or issuable upon the conversion of any
shares of Class C Preferred in any manner which interferes with the timely
conversion of such Class C Preferred except as may otherwise be required to
comply with applicable securities laws.

         6.       REDEMPTION. The Corporation shall have the right to redeem the
outstanding shares of Class C Preferred, in whole or part, at a redemption price
of $10.00 per share (appropriately adjusted for stock dividends, stock splits,
reverse stock splits, and other subdivisions and combinations of Class C
Preferred) plus any earned and unpaid Preferred Dividends, on not less than
thirty (30) calendar days' notice ("Corporate Notice") to the holders of the
Class C Preferred. The Corporation shall be entitled to redeem the Class C
Preferred as provided in this Paragraph 6 only if the closing bid price of the
Common Stock exceeds $4.00 per share (appropriately adjusted for stock
dividends, stock splits, reverse stock splits and other subdivisions and
combinations of Common Stock) for any ten (10) consecutive trading days prior

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to the date of the Corporate Notice. Upon receipt of the Corporate Notice, the
holders of the Class C Preferred to be redeemed will have the option to convert
each share of Class C Preferred and Class B Preferred into two (2) shares of
Common Stock (subject to adjustment as set forth in Section 5 above) until the
close of business on the date fixed for redemption, unless extended by the
Corporation in its sole discretion. All shares of Class C Preferred called for
redemption which are not so converted will be redeemed. Each holder of shares of
Class C Preferred to be redeemed shall surrender the certificate or certificates
representing such shares to the Corporation at the place designated in the
Corporate Notice, and thereupon the applicable redemption price for such shares
as set forth in this Section 6 shall be paid to the order of the person whose
name appears on such certificate or certificates and each surrendered
certificate shall be canceled and retired. Holders of Class C Preferred shall
not have the right to require the Corporation to redeem their shares of Class C
Preferred.<PAGE>

                FIRST SUPPLEMENT TO DEBENTURE PURCHASE AGREEMENT

         This FIRST SUPPLEMENT TO DEBENTURE PURCHASE AGREEMENT ("Supplement")
dated as of July 11, 2000, is made and entered into by and between CORPORATE
TECHNOLOGIES USA, INC., a Minnesota corporation ("Company"), and CONVERGENT
CAPITAL PARTNERS I, L.P., a Delaware limited partnership ("Purchaser").

                                    RECITALS

         WHEREAS, the Company and the Purchaser entered into that certain
Debenture Purchase Agreement dated as of March 9, 2000 (as the same may be
supplemented or amended from time to time, the "Debenture Agreement")
authorizing the issuance and sale of Debentures in the aggregate original
principal amount of Two Million Two Hundred Fifty Thousand Dollars ($2,250,000);
and

         WHEREAS, Vicom, Incorporated, a Minnesota corporation ("Vicom") owns
all of the issued and outstanding stock of the Company; and

         WHEREAS, the parties contemplated that the Company and Vicom may secure
long term financing after execution of the Debenture Agreement; and

         WHEREAS, the Company and Vicom now desire to secure such long-term
financing; and

         WHEREAS, in accordance with Article 11 of the Debenture Agreement and
to facilitate the Company's long term financing needs, the Purchaser has agreed
to exchange the Debenture for a Junior Secured Debenture issued by the Company
and guaranteed by Vicom upon satisfaction of the following conditions.

         NOW, THEREFORE, for and in consideration of the premises and of the
mutual covenants and agreements herein contained, and for other good an valuable
consideration, the receipt and sufficiency of which is hereby acknowledged by
the parties hereto, it is agreed as follows:

1.       DEFINED TERMS. Capitalized terms used in this Supplement which are
         defined in the Debenture Agreement shall have the same meanings as
         defined therein, unless otherwise defined herein.

2.       AMENDED AND SUPPLEMENTAL DEFINITIONS. Section 12.1 of Article 12 of the
         Debenture Agreement is amended by inserting or replacing the following
         defined terms:

                  "Capital Expenditure" means, without duplication, any payment
         made directly or indirectly for the purpose of acquiring or
         constructing fixed assets, real property or equipment which in
         accordance with GAAP would be added as a debit to the fixed asset
         account of the Person making such expenditure, including, without
         limitation, amounts paid or payable under any conditional sale or other
         title retention agreement or under any lease or other periodic payment
         arrangement which is of such a nature that payment

<PAGE>

         obligations of the lessee or obligor thereunder would be required by
         GAAP to be capitalized and shown as liabilities on the balance sheet of
         such lessee or obligor.

                  "EBITDA" shall mean for any period of determination, Net
         Income for such period, plus the aggregate amounts deducted in
         determining Net Income in respect of (a) income taxes for such period,
         (b) interest expense for such period, and (c) depreciation and
         amortization expense and other non-cash charges for such period, in
         each case determined on a consolidated basis in accordance with GAAP.

                  "Funded Indebtedness" means the sum of the outstanding Senior
         Debt plus the outstanding Obligations.

                  "Guarantor" means Vicom, Incorporated, a Minnesota
         corporation.

                  "Guarantor Security Agreement" means the Security Agreement
         dated July11, 2000 executed by the Guarantor in favor of the Purchaser.

                  "Guaranty" means, collectively, the Guaranty of even date
         herewith, executed by the Guarantor in favor of the Purchaser, as
         originally executed and as may be amended, modified or supplemented
         from time to time by written agreement between the Guarantor and the
         Purchaser.

                  "Net Income" shall mean, for any period of determination, the
         net income (but not loss) of the Company and its Subsidiaries for such
         period determined in accordance with GAAP, excluding any extraordinary
         gains or losses during such period; PROVIDED, HOWEVER, for purposes of
         determining Net Income for any period, if under GAAP any Subsidiary is
         treated as a consolidated Subsidiary for part of such period, such
         Subsidiary shall be deemed to be consolidated Subsidiary for such
         entire period.

                  "Permitted Indebtedness" means (a) any Senior Debt in favor of
         the Senior Lender under the Senior Loan Agreement and created pursuant
         thereto;(b) any Indebtedness in favor of the Holders under this
         Agreement and/or the Other Agreements and created pursuant thereto; (c)
         purchase money Indebtedness, operating leases, and Capital Leases
         incurred or entered into by the Company to finance the acquisition of
         capital assets by the Company (whether pursuant to a loan or a Capital
         Lease), provided that such Indebtedness does not exceed One Hundred
         Thousand Dollars ($100,000); (d) Indebtedness secured by Permitted
         Liens; (e) Indebtedness assumed pursuant to an acquisition permitted
         pursuant to the provisions of SECTION 8.3, provided that such
         Indebtedness was not entered into, extended or renewed in contemplation
         of such acquisition, and provided that the aggregate amount of all such
         Indebtedness shall not exceed Fifty Thousand Dollars ($50,000); (f)
         Indebtedness consisting of deferred seller financing incurred in
         connection with an acquisition permitted pursuant to the provisions of
         SECTION 8.3, which Indebtedness is unsecured and subordinated to the
         Obligations in a manner which is reasonably acceptable to the
         Purchaser; (g) other unsecured Indebtedness not exceeding One Hundred
         Thousand Dollars ($100,000) in the aggregate at any time outstanding;
         and (h) the other Indebtedness set forth on Schedule 5.10.

                                       2
<PAGE>

                  "Senior Debt" means, at any given time, the Indebtedness
         (whether now outstanding or hereafter incurred) of the Company in
         respect of the Senior Loan Agreement, in a principal amount not to
         exceed Four Million Dollars ($4,000,000) in revolving loans, plus
         interest, fees, expenses, indemnities and all other amounts payable
         under the Senior Loan Agreement and any notes, security documents,
         guaranties or other loan documents referred to therein or pursuant
         thereto, secured by all assets of the Company.

                  "Senior Lender" means Coast Business Credit, a division of
         Southern Pacific Bank.

                  "Senior Loan Agreement" means the [Credit Agreement] between
         the Company and the Senior Lender, dated as of [June __, 2000] and all
         documents and instruments delivered pursuant thereto in connection with
         the loans and advances made thereunder, as amended, restated or
         modified from time to time (to the extent permitted hereunder and under
         the Subordination Agreement) and including any permitted refinancing or
         replacement thereof.

                  "Senior Loan Documents" means the Senior Loan Agreement and
         the agreements, documents and instruments executed in connection
         therewith or contemplated thereby, and all amendments thereto.

                  "Senior Loans" means revolving loans in the maximum principal
         amount of Four Million Dollars ($4,000,000) made to the Company by the
         Senior Lender under the Senior Loan Agreement and any permitted
         replacements and refinancings thereof.

                  "Subordination Agreement" means the Subordination Agreement
         dated as of July __, 2000 by and among the Purchaser, the Senior
         Lender, and the Company.

                  "Termination Date" means the earliest to occur of (a) June 1,
         2005, (b) the date on which the Debenture is accelerated pursuant to
         SECTION 9, or (c) the date on which the Obligations are paid in full.

3.       EXCHANGE DATE. Subject to the terms and conditions set forth herein, as
         of July 11, 2000 ("Exchange Date"), the Debenture described in the
         Debenture Agreement shall be converted to a Junior Secured Debenture.

4.       DESCRIPTION OF DEBENTURE AND COMMITMENT. Section 1.1 of Article 1 of
         the Debenture Agreement is deleted in its entirety and replaced with
         the following:

                  1.1      DESCRIPTION OF DEBENTURE. The Company will authorize
         the issuance and sale of its Debenture which shall be dated as of the
         Exchange Date, shall be in the aggregate original principal amount of
         Two Million Two Hundred Fifty Thousand Dollars ($2,250,000), and shall
         bear interest at the fixed rate of fourteen percent (14.00%); PROVIDED,
         HOWEVER, that upon the occurrence of any Event of Default under
         SECTIONS 9.1(a) or (c) (but only if such Event of Default arises from a
         failure to comply with SECTION 7.1), and during the continuation
         thereof, the unpaid principal amount, and the past due interest, if
         any, of the Debenture shall bear interest at the rate of sixteen

                                       3
<PAGE>

         percent (16%) percent per annum. Interest on the Debenture shall be
         computed on the basis of a three hundred sixty (360) day year and paid
         for the actual number of days elapsed. The Debenture shall be
         substantially in the form attached hereto as EXHIBIT A..

5.       PRINCIPAL AND INTEREST PAYMENTS. Section 2.1 of Article 2 of the
         Debenture Agreement is deleted and replaced by the following:

                  2.1.     Principal and Interest. PRINCIPAL AND INTEREST
         PAYMENTS. Principal and interest on the Debenture shall be due and
         payable as follows:

                  1)       Unless otherwise accelerated pursuant to the terms
                           hereof, principal shall be due and payable on the
                           first day of each month in equal installments of One
                           Hundred Two Thousand Two Hundred Seventy-Two and
                           72/100 Dollars ($102,272.72) commencing August 1,
                           2003.

                  2)       Interest shall be due and payable (i) monthly in
                           arrears on the first Business Day of each month,
                           commencing July 1, 2000, and (ii) on the Termination
                           Date.

6.       OPTIONAL PREPAYMENTS. Section 2.2 of Article 2 of the Debenture
         Agreement is deleted in its entirety and replaced with the following:

                  2.2      OPTIONAL PREPAYMENTS.

                  1)       At the Company's option, upon notice given as
                           provided below, the Company may, at any time and from
                           time to time, prepay all or any part of the principal
                           of the Junior Secured Debenture, by payment to
                           Purchaser of an amount equal to (i) the principal
                           amount to be prepaid, plus (ii) accrued unpaid
                           interest on the principal amount so prepaid, plus
                           (iii) a premium equal to the percentage of the
                           principal amount so prepaid which is applicable in
                           accordance with the following table based on the date
                           on which such prepayment is made ("Prepayment
                           Premium"):

<TABLE>
<CAPTION>
                          PREPAYMENT DATE                                PREMIUM

<S>                                                                        <C>
              Months 1-12 following the Exchange Date                      5%

              Months 13-24 following the Exchange Date                     4%

              Months 25-36 following the Exchange Date                     3%

              Month 37 following the Exchange Date and thereafter          0%
</TABLE>

                  Each prepayment under this SECTION 2.2 shall be applied first
         to accrued interest and premium (if any) on the principal amount
         prepaid, second to installments of principal to be applied in inverse
         order of maturity, and third to any expenses and/or damages to which
         Purchaser may be entitled. The amount of

                                       4
<PAGE>

         any such prepayment may not be reborrowed by the Company. The Company
         shall give notice of any optional prepayment to Purchaser not less than
         fifteen (15) days nor more than thirty (30) days before the date for
         prepayment, specifying in each such notice the date upon which
         prepayment is to be made and the principal amount (together with
         accrued interest and any applicable Prepayment Premium) to be prepaid
         on such date. Notice of prepayment having been so given, the applicable
         prepayment amount shall become due and payable on the specified
         prepayment date. The Company shall have no right to prepay the Junior
         Secured Debenture except as provided in this SECTION 2.2 or in SECTION
         2.3.

7.       AFFIRMATIVE COVENANTS.

         1)       Section 7.19 is deleted in its entirety and replaced with the
                  following:

                           7.19.    SBIA INFORMATION. The Company will:

                                    (a)      as soon as reasonably practical,
                           but in any event within twenty (20) days after the
                           request of the Purchaser, furnish to the Purchaser
                           all information necessary in order for the Purchaser
                           to prepare and file SBA Form 468 and other
                           information requested or required by any governmental
                           authority asserting jurisdiction over the Purchaser;

                                    (b)      as soon as reasonably practical
                           after the written request of the Purchaser, confirm
                           the use of the proceeds as described in SECTION 1.3
                           above; and

                                    (c)      with reasonable promptness, provide
                           such information as from time to time the Purchaser
                           may request to enable the Purchasers to comply with
                           the SBIA.

         2)       A new Section 7.20 and 7.21 shall be inserted at the end of
                  Article 7 of the Debenture Agreement:

                           7.20     SBIA COMPLIANCE.

                                    (a)      So long as the Purchaser is an SBIC
                           (i) without the prior written consent of such
                           Purchaser, the Company will not use the proceeds from
                           the sale of the Junior Secured Debentures for any
                           purpose other than as set forth in SECTION 1.3 above,
                           (ii) the Company will not use the proceeds from the
                           sale of the Junior Secured Debentures for any
                           prohibited purposes set forth in SECTION 1.3, (iii)
                           the Company will not change its business activity in
                           any manner which, by reason of such change in
                           business activity, would cause the Company to fall
                           within a different SIC Code and thereby render it
                           ineligible as a "small business concern" under the
                           SBIA, and (iv) the Company will at all times comply
                           with the non-discrimination requirements of 13 CFR
                           Parts 112, 113 and 117.

                                       5
<PAGE>

                                    (b)      The Company will at all times
                           permit the Purchaser and, if necessary, a
                           representative of the SBA, access to its records and
                           the Company will provide such information as the
                           Purchaser may reasonably request in order to verify
                           compliance with this SECTION 7.20 including, without
                           limitation, an officer's certificate indicating such
                           compliance.

                                    (c)      As of the Closing and for at least
                           one year thereafter, at least fifty-one percent (51%)
                           of the employees (based on total workforce) and
                           assets (based on the stated value of all tangible
                           assets reflected on its financial statements) of the
                           Company, together with its affiliates (as defined in
                           13 CFR Section 121.103), are and will remain located
                           within the United States.

                           7.21 AMENDMENT TO SENIOR LOAN DOCUMENTS. The Company
                  shall promptly provide Purchaser with copies of all proposed
                  amendments or modifications to the Senior Loan Documents and
                  of all other loan agreements to which the Company is a party;

8.       FINANCIAL COVENANTS. A new Section 8.10 shall be inserted at the end of
         Article 8 of the Debenture Agreement:

                  8.10     FINANCIAL COVENANTS

                  1)       MINIMUM LEVERAGE RATIO. The Company shall not allow
                           the ratio of its Consolidated EBITDA (less cash
                           Capital Expenditures) to the current portion of its
                           Funded Indebtedness for the applicable period to be
                           less than the amounts set forth in Schedule 8.10(a)
                           for the applicable period identified therein.

                  2)       SENIOR DEBT. The Company shall not allow the Senior
                           Debt to exceed Four Million Dollars ($4,000,000).

9.       EVENT OF DEFAULT. The following shall be inserted as a new subparagraph
         (m) under Article 9, Section 9.1 of the Debenture Agreement:

                           (m)      The Company or Guarantor shall fail to pay,
                  when due (whether upon acceleration or otherwise), any
                  principal, interest or other sums payable under the Senior
                  Loan Documents; or

10.      SECURITY FOR JUNIOR SECURED DEBENTURE. The Junior Secured Debenture
         will be secured by the same Collateral securing the Debenture and is
         guaranteed pursuant to the Guaranty; PROVIDED, HOWEVER, that the
         Purchaser will execute the Subordination Agreement.

11.      ADDITIONAL WARRANTS. Section (d) of Article 11 of the Debenture
         Agreement is deleted and replaced by the following:

                  (d)      ADDITIONAL WARRANTS. On the Exchange Date, Vicom
         shall execute a warrant agreement (the "Additional Warrant Agreement")
         in form and substance

                                       6
<PAGE>

         acceptable to the Purchaser pursuant to which Vicom will issue seven
         (7) year detachable warrants to the Purchaser. The Additional Warrant
         Agreement shall provide that the Purchaser may purchase Fifty Thousand
         (50,000) shares of Vicom's common stock on and after the Exchange Date,
         and an additional Thirty Thousand (30,000) shares of Vicom's common
         stock on and after the first anniversary of the Exchange Date, and an
         additional Thirty Thousand (30,000) shares of Vicom's common stock on
         the second anniversary of the Exchange Date. The exercise price shall
         be seventy-five percent (75%) of the seven-day average trading price of
         Vicom's common stock at each issue date. The Additional Warrant
         Agreement shall be executed and delivered to the Purchaser even if the
         Company or Vicom determines to prepay the Junior Secured Debenture.

12.      CONDITIONS TO EFFECTIVENESS. This Supplement and its effectiveness are
         contingent upon the payment by the Company to the Purchaser of its
         attorneys fees incurred in the negotiation, preparation and execution
         of this Agreement and the Additional Warrant Agreement, and all
         out-of-pocket costs incurred by the Bank in connection therewith, as
         well as receipt by the Purchaser of the following, each to be in form
         and substance satisfactory to the Purchaser, unless otherwise agreed in
         writing by the Purchaser:

         a.       This Supplement duly executed by the Company;

         b.       The Guaranty, duly executed by an officer of the Guarantor;

         c.       The Junior Secured Debenture, duly executed by the Company;

         d.       The Additional Warrant Agreement dated of even dated herewith
                  duly executed by the Company;

         e.       Evidence of authorization by the Company's Board of Directors
                  of execution of this Agreement by the Company and of the
                  transaction contemplated by this Agreement and any related
                  documents and agreements;

         f.       The Company shall pay to Purchaser all expenses related to the
                  Long-Term Investment including, without limitation,
                  accountant's fees, legal fees, filing fees,. insurance, fees
                  for searches on account of the Company, and such further
                  amounts as shall be sufficient to cover the cost and expenses
                  incurred by Purchaser with respect to the Long-Term
                  Investment;

         g.       A Certificate of the Secretary of the Company certifying as to
                  (i) the resolutions of the board of directors of the Company
                  approving the execution and delivery of this Supplement, (ii)
                  the fact that the articles of incorporation and bylaws of the
                  Company, which were certified and delivered to the Purchaser
                  pursuant to the Certificate of Authority of the Company's
                  secretary or assistant secretary dated as of March 9, 2000 in
                  connection with the execution and delivery of the Debenture
                  Agreement continue in full force and effect and have not been
                  amended or otherwise modified except as set forth in the
                  Certificate to be delivered, and (iii) certifying that the
                  officers and agents of the Company who have been certified to
                  the Purchaser, pursuant to the Certificate of Authority of the

                                       7
<PAGE>

                  Company's secretary or assistant secretary dated as of March
                  9, 2000, as being authorized to sign and to act on behalf of
                  the Company continue to be so authorized or setting forth the
                  sample signatures of each of the officers and agents of the
                  Company authorized to execute and deliver this Supplement and
                  all other documents, agreements and certificates on behalf of
                  the Company;

         h.       A certified copy of the resolutions of the Boards of Directors
                  of the Guarantor authorizing or ratifying the transactions
                  contemplated hereby, and the execution, delivery and
                  performance of the Guaranty and other agreements to which it
                  is a party, and designating the officers authorized to execute
                  such documents and to perform the obligations of such
                  Guarantor thereunder;

         i.       An opinion of the Company's counsel as to the matters set
                  forth in Section 13 hereof and as to such other matters as the
                  Purchaser shall require;

         j.       The Purchaser's investment committee shall have approved the
                  Long-Term Investment; and

         k.       Such other documents, actions and information as the Purchaser
                  may reasonably request.

13.      ADDITIONAL REPRESENTATIONS AND WARRANTIES. In addition to the
         Representations and Warranties contained in the Debenture Agreement,
         the Company hereby represents and warrants to the Purchaser as follows:

         a.       The Company has all requisite power and authority to execute
                  this Supplement, the Junior Secured Debenture, and the
                  Additional Warrant Agreement and to perform all of its
                  obligations hereunder, and this Supplement and the Additional
                  Warrant Agreement have been duly executed and delivered by the
                  Company and constitute legal, valid and binding obligations of
                  the Company, enforceable in accordance with their terms;

         b.       The execution, delivery and performance by the Company of this
                  Supplement and the Additional Warrant Agreement have been duly
                  authorized by all necessary corporate action and do not (i)
                  require any authorization, consent or approval by any
                  governmental department, commission, board, bureau, agency or
                  instrumentality, domestic or foreign, (ii) violate any
                  provision of any law, rule or regulation or of any order,
                  writ, injunction or decree presently in effect, having
                  applicability to the Company, or the articles of incorporation
                  or by-laws of the Company, or (iii) result in a breach of or
                  constitute a default under any indenture or loan or credit
                  agreement or any other agreement, lease or instrument to which
                  the Company is a party or by which it or its properties may be
                  bound or affected;

         c.       As of the Exchange Date, no Default or Event of Default has
                  occurred and is continuing;

         d.       As of the Exchange Date, there has been no occurrence or event
                  which has or could have a Material Adverse Effect;

                                       8
<PAGE>

         e.       All representations and warranties contained in this
                  Supplement, the Debenture Purchase Agreement, and the Other
                  Agreements are true and correct as of the Exchange Date as
                  though made on and as of such date, except to the extent that
                  such representations and warranties relate solely to an
                  earlier date.

         f.       The Company will use the proceeds from the sale of the Junior
                  Secured Debentures for the purposes set forth on Schedule 1.3
                  of the Debenture Agreement. No portion of the proceeds from
                  the sale of the Junior Secured Debenture (a) will be used to
                  provide capital to an SBIC, (b) will be used outside the
                  United States (except (i) to acquire materials and industrial
                  property rights abroad for a domestic operation or (ii) as may
                  be transferred to a controlled foreign subsidiary, so long as
                  at least fifty-one percent (51%) of the assets, employees and
                  activities of the Company will remain within the United
                  States), or (c) will be used for any purpose "contrary to the
                  public interest (including but not limited to activities which
                  are in violation of law) or inconsistent with free competitive
                  enterprise", within the meaning of 13 CFR Section 107.720. The
                  Company's primary business activity do not involve, directly
                  or indirectly, providing funds to others, purchasing or
                  discounting debt obligations, factoring or long-term leasing
                  of equipment with no provision for maintenance or repair, and
                  the Company is not classified under Major Group 65 (Real
                  Estate) of the Standard Industrial Classification Manual
                  prepared by the Office of Management and Budget.

14.      REFERENCES. All references in the Debenture Agreement to "this
         Agreement" shall be deemed to refer to the Debenture Agreement as
         amended and supplemented hereby; and any and all references in the
         Other Agreements to the Debenture Agreement shall be deemed to refer to
         the Debenture Agreement as amended hereby. All references in the
         Debenture Agreement or in any other of the Other Agreements to the
         Warrant shall hereafter be deemed to refer to the Warrant and
         Additional Warrant, as the same may be amended from time to time.

15.      NO WAIVER. The execution of this Supplement and acceptance of the
         Junior Secured Debentures and any documents related hereto shall not be
         deemed to be a waiver of any Default or Event of Default under the
         Debenture Agreement or breach, default or event of default under any
         Other Agreement held by the Purchaser, whether or not known to the
         Purchaser and whether or not existing on the date of this Supplement.

16.      RELEASE. The Company hereby absolutely and unconditionally releases and
         forever discharges the Purchaser, and any and all participants, parent
         corporations, subsidiary corporations, affiliated corporations,
         insurers, indemnitors, successors and assigns thereof, together with
         all of the present and former directors, officers, agents and employees
         of any of the foregoing, from any and all claims, demands or causes of
         action of any kind, nature or description, whether arising in law or
         equity or upon contract or tort or under any state or federal law or
         otherwise, which the Company has had, now has or has made claim to have
         against any such person for or by reason of any act, omission, matter,
         cause or thing whatsoever arising from the beginning of time to and
         including the

                                       9
<PAGE>

         date of this Supplement, whether such claims, demands and causes of
         action are matured or unmatured or known or unknown.

17.      COSTS AND EXPENSES. The Company hereby reaffirms its agreement under
         the Debenture Agreement to pay or reimburse the Purchaser on demand for
         all costs and expenses incurred by the Purchaser in connection with the
         Debenture Agreement and the Other Agreements contemplated thereby,
         including without limitation all reasonable fees and disbursements of
         legal counsel. Without limiting the generality of the foregoing, the
         Company specifically agrees to pay all fees and disbursements of
         counsel to the Purchaser for the services performed by such counsel in
         connection with the preparation of this Supplement and the documents
         and instruments incidental hereto.

18.      MISCELLANEOUS. This Supplement may be executed in any number of
         counterparts, each of which when so executed and delivered shall be
         deemed an original and all of which counterparts, taken together, shall
         constitute one and the same instrument.

19.      NO OTHER CHANGES. Except as explicitly amended by this Supplement, all
         of the terms and conditions of the Debenture Agreement shall remain in
         full force.

                            [Signature Pages Follow]

                                       10
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Supplement to
be duly executed as of the day and year first above written above.

CONVERGENT CAPITAL PARTNERS I, L.P.,      CORPORATE TECHNOLOGIES USA, INC.,
a Delaware limited partnership            a Minnesota corporation

By: CONVERGENT CAPITAL, LLC
Its: General Partner

By:                                       By:
   -----------------------------------       -----------------------------------
Name:                                     Name:
     ---------------------------------         ---------------------------------
Its:                                      Its:
    ----------------------------------        ----------------------------------

                                       11
<PAGE>

                                SCHEDULE 8.10(a)
                                       TO
                FIRST SUPPLEMENT TO DEBENTURE PURCHASE AGREEMENT

<TABLE>
<CAPTION>
                           MINIMUM LEVERAGE RATIO

<S>                                                         <C>
      Third Quarter - 2000                                  1.00:1.00
      Fourth Quarter - 2000                                 1.20:1.00
      First Quarter - 2001                                  1.35:1.00
      Second Quarter - 2001                                  1.50:100
      Third Quarter - 2001                                  1.65:1.00
      Fourth Quarter - 2001                                  1.80:100
      First Quarter 2002                                    2.00:1.00
      Second Quarter - 2002                                 2.20:1.00
      Third Quarter - 2002                                  2.40:1.00
      Fourth Quarter - 2002                                 2.65:1.00
      First Quarter 2003                                    2.90:1.00
      Second Quarter - 2003                                 3.20:1.00
      Third Quarter - 2003                                  3.50:1.00
      and each quarter thereafer
</TABLE>

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