Document:

<PAGE>

                                                                   Exhibit 10.30

                            JOINT FILING AGREEMENT

     In accordance with Rule 13d-1(k) promulgated under the Securities Exchange
Act of 1934, the undersigned agree to the joint filing of a Schedule 13D
(including any and all amendments thereto) on behalf of each of them with
respect to the common shares, nominal value $1.50 per share, of SBS Broadcasting
S.A., and further agree to the filing of this agreement as an Exhibit thereto.

Date:  March 9, 2000                   United Pan-Europe Communications N.V.
                                       By:      /S/ ANTON M. TUIJTEN
                                       Name:    Anton M. Tuijten
                                       Title:   General Counsel

                                       UnitedGlobalCom, Inc.
                                       By:      /S/ ELLEN P. SPANGLER
                                       Name:    Ellen P. Spangler
                                       Title:   Senior Vice President<PAGE>

                                                                     Exhibit 4.1

                                 ONESOFT LOGO
NUMBER                        OneSoft Corporation                         SHARES
OS                      INCORPORATED UNDER THE LAWS OF              COMMON STOCK
COMMON STOCK                 THE STATE OF DELAWARE

                                                               CUSIP 68273J 10 5

THIS CERTIFIES that
                                            SEE REVERSE FOR CERTAIN RESTRICTIONS
is the owner of

FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK,PAR VALUE $ .001 PER SHARE,
                                      OF
                              ONESOFT CORPORATION
                  (the "Corporation"), a Delaware Corporation

  The shares represented by this certificate are transferable on the stock
transfer books of the Corporation by the holder of record hereof, or by duly
authorized attorney or legal representative, upon the surrender of this
certificate properly endorsed.

  This certificate is not valid until countersigned and registered by the
Transfer Agent and Registrar.

  IN WITNESS WHEREOF, the Corporation has caused this certificate to bear the
facsimile signatures of its duly authorized officers and to be sealed with the
facsimile of its corporate seal.

Dated:
                              ONESOFT CORPORATION
                                   CORPORATE
                                      SEAL
                                      1997
                                    DELAWARE
                                       *

/s/  Paul D. Economon                /s/ James W. MacIntyre, IV
      SECRETARY                         CHAIRMAN OF THE BOARD

COUNTERSIGNED AND REGISTERED:
              AMERICAN STOCK TRANSFER & TRUST COMPANY
                         TRANSFER AGENT AND REGISTRAR

BY
                            AUTHORIZED SIGNATURE
<PAGE>

  The Corporation will furnish to any stockholder upon request and without
charge a full statement of the powers, designations, preferences and relative,
participating, optional, or other special rights of each authorized class of
stock or series thereof and the qualifications, limitations or restrictions of
such preferences and/or rights, to the extent that the same have been fixed, and
of the authority of the board of directors to designate the same with respect to
other series.  Such request may be made to the Corporation or to its transfer
agent.

  The following abbreviations, when used in the inscription on the face of this
certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

  TEN COM  -  as tenants in common
  TEN ENT  -  as tenants by the entireties
  JT TEN   -  as joint tenants with right
              of survivorship and not as
              tenants in common

UNIF GIFT MIN ACT - _______ Custodian ________
                    (Cust)             (Minor)
                    under Uniform Gifts to Minors
                    Act ______________________
                               (State)

UNIF TRANS MIN ACT - ______ Custodian _________
                     (Cust)             (Minor)
                     under Uniform Transfers to Minors
                     Act ______________________
                                (State)

    Additional abbreviations may also be used though not in the above list.

  For value received, _______________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
 IDENTIFYING NUMBER OF ASSIGNEE
___________________________________________
___________________________________________

_______________________________________________________________________________
  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING ZIP CODE, OF ASSIGNEE)

_______________________________________________________________________________
_______________________________________________________________________________
_______________________________________________________________________  shares
of common stock represented by the within certificate, and do hereby irrevocably
constitute and appoint ________________________________________________________
___________________________________________________________________ Attorney,
to transfer the said shares on the books of the within named Corporation, with
full power of substitution in the premises.

Dated: _________________________
                                         X_____________________________________
                                         X_____________________________________
                                NOTICE:  THE SIGNATURES TO THIS ASSIGNMENT MUST
                                         CORRESPOND WITH THE NAME(S) AS WRITTEN
                                         UPON THE FACE OF THE CERTIFICATE IN
                                         EVERY PARTICULAR, WITHOUT ALTERATION OR
                                         ENLARGEMENT OR ANY CHANGE WHATSOEVER.

Signature(s) Guaranteed:

By _______________________________________
THE SIGNATURE(S) MUST BE GUARANTEED BY AN
ELIGIBLE GUARANTOR INSTITUTION (BANKS,
STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
AND CREDIT UNIONS WITH MEMBERSHIP IN AN
<PAGE>

APPROVED SIGNATURE GUARANTEE MEDALLION
PROGRAM),  PURSUANT TO S.E.C. RULE 17Ad-15.

KEEP THIS CERTIFICATE IN A SAFE PLACE.  IF IT IS LOST, STOLEN, MUTILATED OR
DESTROYED, THE CORPORATION WILL REQUIRE A BOND OF INDEMNITY AS A CONDITION TO
THE ISSUANCE OF A REPLACEMENT CERTIFICATE.<PAGE>

                                                                  Exhibit 4.3(a)

                                 AMENDMENT ONE
                                      TO
               WARRANT TO PURCHASE 60,651 SHARES OF COMMON STOCK
                                      OF
                              ONESOFT CORPORATION

     This AMENDMENT ONE TO WARRANT TO PURCHASE 60,651 SHARES OF COMMON STOCK OF
ONESOFT CORPORATION (the "Amendment") is made this 28th day of February, 2000 by
and between OneSoft Corporation (the "Company") and Deutsche Bank Securities,
Inc. (the "Holder").

WHEREAS, the Holder is the holder of that certain Warrant to Purchase 60,651
Shares of Common Stock of OneSoft Corporation (the "Warrant"); and

WHEREAS, the Holder and the Company desire to amend the Warrant to conform to
their agreement as set forth in a letter from the Holder to the Company dated
April 27, 1999.

NOW THEREFORE, the Holder and the Company hereby agree as follows:

1.  The first sentence of the preamble to the Warrant is hereby amended to read
    in its entirety as follows: "This is to certify that, FOR VALUE RECEIVED,
    DEUTSCHE BANK SECURITIES, INC. or its registered assigns pursuant to Section
    (d) hereof ("Holder"), is entitled as of April 27, 1999 to purchase, subject
    to the provisions of this Warrant, from OneSoft Corporation, a Delaware
    corporation (the "Company"), Sixty Thousand Six Hundred Fifty -One (60,651)
    fully paid validly issued and nonassessable shares of Common Stock, par
    value $.001 per share of the Company ("Common Stock"), at the exercise price
    of $6.59 per share until April 27, 2004."

2.  Section (f) of the Warrant is hereby amended to read in its entirety as
    follows: "(f) [reserved]."

3.  The last sentence of Section (i) of the Warrant is hereby deleted.

4.  Section (l)(3) of the Warrant is hereby amended to read in its entirety as
    follows: "(3) Determination of Fair Market Value. For purposes of this
                  ----------------------------------
    Section (l), fair market value of a share of Common Stock as of a particular
    date (the "Determination Date") shall be determined in accordance with
    Section (c) of this Warrant."
<PAGE>

IN WITNESS WHEREOF, the Holder and the Company have  caused this Amendment to be
executed by their respective officers thereunto duly authorized.

DEUTSCHE BANK SECURITIES, INC.

By: /s/ Kathryn E. Coffey
    ---------------------
Name: Kathryn E. Coffey
      -------------------
Title: Managing Director
       ------------------

ONESOFT CORPORATION

By: /s/ Frederick C. Hawkins, III
    -----------------------------
Name: Frederick C. Hawkins, III
      ---------------------------
Title: CFO
       --------------------------<PAGE>

                                                                    Exhibit 10.2

                              ONESOFT CORPORATION
                            1505 Farm Credit Drive
                            McLean, Virginia 22102

                                 March 7, 2000

James W. MacIntyre, IV

     Employment Agreement
     --------------------

Dear Jim:

This letter is to confirm our understanding and agreement with respect to (i)
your employment by OneSoft Corporation (the "Company") for the period from and
after the date of execution of this agreement (the "Effective Date"), (ii) your
agreement to protect and preserve information and property which is confidential
and proprietary to the Company, and (iii) your agreement not to compete with the
Company (the terms and conditions set forth in this letter shall hereinafter be
referred to as this "Agreement").  In consideration of the mutual promises and
covenants contained in this Agreement and for other good and valuable
consideration, the receipt and sufficiency of which are hereby mutually
acknowledged, the Company and you have agreed as follows:

1.  Employment.  The Company shall continue to employ you, and you agree to
    ----------
continue to be employed by the Company, as Chief Executive Officer ("CEO") of
the Company, and you agree to perform the services and responsibilities
consistent with such office, and such other services and responsibilities as may
be prescribed by the Board of Directors from time to time which are consistent
with such position and the other terms hereof.  You agree to devote the majority
of your business time to the business of the Company; provided that you may
                                                      -------- ----
serve on the Boards of Directors or act as an officer of other companies and as
an active investor, as well as participate in charitable and other non-profit
endeavors, provided that such service and/or participation does not violate the
provisions of Section 5 of this Agreement and does not cause you to fail
substantially to perform your duties under this Agreement.

2.  Term of Employment.
    ------------------

     (a) Term; Termination.  Your employment shall be governed by this
         -----------------
     Agreement, commencing as of the Effective Date and continuing through
     December 31, 2003; provided, however, that this Agreement may be renewed
     upon the written agreement of the parties for additional periods of no more
     than three years each thereafter (the original period and any successive
     renewal thereof, if any, being hereinafter referred to as the "Term").  If
     this Agreement is not renewed pursuant to this Section or if the parties
     fail to negotiate a new agreement, your employment by the Company will
     terminate at the end of the Term.  Notwithstanding the foregoing, your
     employment hereunder may be terminated upon any of the following:

          (i)  immediately upon your death;
<PAGE>

          (ii)  by the Company:

               (A) following your failure, due to illness, accident or any other
               physical or mental incapacity, to perform the services provided
               for hereunder for an aggregate of ninety (90) days within any
               period of one hundred and twenty (120) consecutive days during
               the term hereof;

               (B) for Cause or by a Constructive Termination (each as
               hereinafter defined); or

               (C)  without Cause; or

          (iii)  by you, voluntarily upon ninety (90) days' prior written notice
          to the Company.

     Subject to Section 3 hereof, the right of the Company to terminate your
     employment hereunder, to which you hereby agree, shall be exercisable by
     written notice sent to you by the Company and shall be effective as of the
     date of such notice.  The termination of your employment for any reason
     shall not result in the termination of your covenants and obligations under
     Section 5 hereof.

     (b) Definition of "Cause".  Termination of your employment by the Company
         ---------------------
     shall constitute a termination for "Cause" if such termination is for one
     or more of the following reasons:

          (i) any action or omission by you involving willful misconduct or
          gross negligence which causes material harm to the Company; or

          (ii) your conviction of a felony, in connection with the performance
          of your duties and responsibilities hereunder or which otherwise
          materially and adversely affects your ability to perform such duties
          and responsibilities or materially and adversely affects the business
          or reputation of the Company.

     (c) Definition of "Constructive Termination".  As used herein, a
         ----------------------------------------
     "Constructive Termination" shall mean, in each case followed by the written
     notice provided for in the immediately following sentence, (i) a diminution
     by the Company in your authority, functions, duties or responsibilities
     with the Company, including but not limited to the appointment, election or
     other engagement of any person in an executive capacity to whom you are
     requested or directed by the Board of Directors to report or who, without
     being subordinate to you and subject to your direction, is authorized or
     directed by the Board of Directors to perform any of the functions
     previously performed by you or who is authorized or directed to supervise
     or have report to such other person any employee or employees of the
     Company who previously you supervised or had report to you or your
     subordinates; (ii) a Change of Control (as defined below); (iii) a failure
     by the Company to obtain an assumption of this Agreement by a successor in
     accordance with Section 10(e); (iv) a change in the principal location of
     the performance of your duties and responsibilities to a location outside
     the Washington, D.C. greater metropolitan

                                      -2-
<PAGE>

     area; (v) a failure to be retained as a member of the Board of Directors of
     the Company; or (vi) a failure by the Company to pay any material amount
     due to you pursuant to the terms of this Agreement within a reasonable time
     after it becomes due, except for an inadvertent error to make such payment.
     After the occurrence or existence of a Constructive Termination, you may
     give written notice to the Company thereof, upon which the Company shall be
     deemed to have effected such a Constructive Termination, with the effects
     provided for in Section 2(e), Sections 3(b), (d), (h), (i), and (j), and
     Section 4(b).

     (d) Definition of "Change of Control".  As used herein, a "Change of
         ----------------------------------
     Control" shall be deemed to have occurred upon the occurrence of any of the
     following:

          (i) any sale, lease, exchange or other transfer (in one transaction or
          a series of transactions) of all or substantially all of the assets of
          the Company;

          (ii) any consolidation or merger of the Company (including, without
          limitation, a triangular merger) where the existing shareholders
          immediately prior to the consolidation or merger, would not,
          immediately after the consolidation or merger, beneficially own,
          directly or indirectly, shares representing in the aggregate more than
          fifty percent (50%) of the combined voting power of all the
          outstanding securities of the corporation issuing cash or securities
          in the consolidation or merger; or

          (iii)  any "person," as such term is used in Section 13(d) of the
          Securities Exchange Act of 1934, as amended (or any successor
          provision) (the "Exchange Act") (other than the Company, any employee
          benefit plan of the Company or any entity organized, appointed or
          established by the Company for or pursuant to the terms of any such
          plan), together with all "affiliates" and "associates" (as such terms
          are defined in Rule 12B-2 under the Exchange Act or any successor
          provision) of such person, shall become the "beneficial owner" or
          "beneficial owners" (as defined in Rules 13d-3 and 13d-5 under the
          Exchange Act or any successor provision), directly or indirectly, of
          securities of the Company representing in the aggregate (A) in the
          event the Company is not a "Reporting Company" (meaning a Company that
          is subject to the reporting requirements of the Exchange Act and has
          registered shares of a class of equity securities pursuant to Section
          12(g) or 12(b) of the Exchange Act), fifty percent (50%) or more or
          (B) in the event the Company is a Reporting Company, twenty percent
          (20%) or more of either (1) the then outstanding shares of Common
          Stock of the Company or (2) the combined voting power of all then
          outstanding securities of the Company having the right under ordinary
          circumstances to vote in an election of the Board of Directors of the
          Company including pursuant to a consolidation or merger of the Company
          to which clause (ii) does not apply.

     (e) Actions Upon Termination.  Upon termination of your employment with the
         -------------------------
     Company for any reason, you shall cease holding yourself out as an employee
     of the Company and shall thereafter refrain from taking any action
     purportedly on behalf of the Company.

                                      -3-
<PAGE>

3.  Compensation.
    ------------

     (a) Annual Compensation.  In consideration for your services under this
         -------------------
     Agreement, you shall be paid a salary at the annual rate of three hundred
     thousand dollars ($300,000) (your "Base Salary"), payable in such
     installments as the Company generally pays salary to its employees, less
     any amounts required to be withheld under applicable law.  Your Base Salary
     shall be reviewed by the Board of Directors or the Compensation Committee
     thereof annually, within ninety (90) days after calendar yearend, and shall
     be increased as the Board or such committee may determine in its sole
     discretion, effective as of January 1 of each year during the Term.

     (b) Annual Incentive Bonus.  In addition to the foregoing, you shall be
         ----------------------
     eligible to receive an annual incentive bonus of up to one hundred thousand
     dollars ($100,000), such bonus to be paid in quarterly installments in the
     first year of the Term and annually thereafter in such amounts as the Board
     of Directors or Compensation Committee or their designee may determine in
     its sole discretion in recognition of your performance and that of the
     Company in accomplishing such performance goals as the Board of Directors
     or Compensation Committee or its designee may establish within ninety (90)
     days of the beginning of each calendar year of the Term (any such annual
     incentive bonus is hereinafter referred to as your "Annual Incentive
     Bonus"), provided that, nothing in this Section shall prevent the Board
              -------------
     from providing an Annual Incentive Bonus of greater than $100,000 if in its
     sole discretion it determines that such increased bonus is warranted.  In
     the event that the Board fails to establish any performance goals for you
     within such ninety day period, your Annual Incentive Bonus for that year
     shall be calculated as though you accomplished the performance goals.  Upon
     any termination of your employment by the Company without Cause or by a
     Constructive Termination, by the parties' failure to extend the Term, or by
     the parties' failure to enter into another mutually acceptable agreement or
     due to the expiration of the Term, you shall receive the maximum amount of
     the Annual Incentive Bonus for that year. At all times, the amount of the
     Annual Incentive Bonus and the criteria on which the Annual Incentive Bonus
     is based are at the sole discretion of the Board of Directors or
     Compensation Committee or their designee.

     (c) Stock Option Eligibility.  You shall be eligible to participate in all
         ------------------------
     equity compensation plans of the Company to the extent the Company has
     instituted such plans, limited to stock option plans, restricted stock
     plans and stock purchase plans, which are available to other executives of
     the Company, provided that your participation and the details of such
                  -------------
     participation in each plan are approved by the Compensation Committee.

     (d) Termination Without Cause or by a Constructive Termination.  In the
         ----------------------------------------------------------
     event your employment shall be terminated during the Term by the Company
     without Cause or by a Constructive Termination, you shall be entitled to
     receive payment of an amount equal to twelve  (12) months of your annual
     Base Salary in effect immediately prior to such termination plus your
     Annual Incentive Bonus for such calendar year in accordance with Section
     3(b).  Such payments shall be made by the Company in a lump-sum payment
     within a reasonable time (but not later than thirty (30) days after such
     termination) and shall be less any applicable federal, state, local or
     other employment-related deductions.  Notwithstanding any termination of
     your employment, you shall continue to be bound by the provisions of
     Section 5 of this Agreement. The Company shall have no obligation to make
     or continue any payment pursuant to this Section unless you are in material
     compliance with your obligations under Section 5 and have signed the
     Release as set forth in Section 3(j).

                                      -4-
<PAGE>

     (e)  Termination with Cause or by You during Term. In the event your
          --------------------------------------------
     employment shall be terminated during the Term by the Company for Cause or
     by you voluntarily (which shall not include any Constructive Termination),
     no further compensation or benefits of any kind shall be payable or
     provided to you hereunder, except for any salary and any health insurance
     benefits accrued as of the date of termination or required by applicable
     law; provided, however, that you shall continue to be bound by the terms
     and conditions of this Agreement.

     (f) Terminations Due to Death or Disability.  In the event your employment
         ---------------------------------------
     shall be terminated by the Company due to your death or disability during
     the Term, you or your estate, as the case may be, shall be entitled to
     receive any salary and benefits accrued as of the date of termination;
     provided that, in the event of your disability, you shall also be entitled
     to receive certain disability insurance payments in accordance with the
     Company's disability insurance policies then in effect. The Company shall
     have no other obligations to you under such circumstances except as set
     forth in the preceding sentence.

     (g) Expiration Occasioned by Company.  If the Company determines under
         --------------------------------
     Section 2(a) above that the Term shall not be extended despite your desire
     to extend such Term or the parties fail to enter into another mutually
     acceptable agreement, and, subject to any earlier termination of this
     Agreement in accordance with its terms, in which case this Section 3(g)
     shall not apply, you shall be entitled to receive payment of an amount
     equal to twelve (12) months of your annual Base Salary then in effect
     immediately prior to such termination plus your Annual Incentive Bonus for
     such calendar year in accordance with Section 3(b). Such payments shall be
     made by the Company in a lump-sum payment within a reasonable time (but no
     later than thirty (30) days after such termination) and shall be less any
     applicable federal, state, local or other employment-related deductions.
     Furthermore, if the Company decides not to extend the Term, then you shall
     be entitled to the continuation of benefits set forth in Section 3(i).  The
     Company shall have no obligation to make or continue any payment pursuant
     to this Section unless you are in material compliance with your obligations
     under Section 5 and have signed the Release as set forth in Section 3(j).

     (h) Effect of Termination upon Equity Compensation.  In the event your
         ----------------------------------------------
     employment is terminated without Cause or by a Constructive Termination,
     any options then held by you and not then vested shall accelerate and
     become immediately exercisable and any restrictions or repurchase rights in
     favor of the Company with respect to any restricted stock then held by you
     shall terminate and such shares, if you hold any, shall no longer be
     subject to repurchase by the Company, if they had been so subject
     previously.  In the event of the termination of your employment by the
     Company or by you other than as set forth in the preceding sentence or the
     expiration of this Agreement, the vesting of any options and restricted
     stock then held by you shall be as set forth in the agreements governing
     such options and restricted stock.  The Company shall have no obligation to
     accelerate such options unless you are in material compliance with your
     obligations under Section 5 and have signed the Release as set forth in
     Section 3(j).

     (i) Continuation of Benefits.  In the event your employment hereunder is
         ------------------------
     terminated either by you except pursuant to Constructive Termination or by
     the Company with Cause during the Term, then you may continue your medical
     and dental benefits pursuant to the Consolidated

                                      -5-
<PAGE>

     Omnibus Budget Reconciliation Act of 1985 ("COBRA") at your own cost. If
     your employment hereunder is terminated during the Term by the Company
     without Cause or as set forth in Section 3(g) or by a Constructive
     Termination, and you choose to continue your benefits pursuant to COBRA,
     the Company will pay the cost of the medical and dental premiums for a
     period of twelve (12) months, after which you may continue the benefits at
     your own cost for the period of time required by COBRA. The Company shall
     have no obligation to pay the cost of the medical and dental premiums
     unless you are in full compliance with your obligations under Section 5 and
     have signed the Release as set forth in Section 3(j).

     (j) Waiver and Release of Claims.  The Company's obligation to accelerate
         ----------------------------
     your options or make any payments pursuant to Sections 3(d), (g), (h) or
     (i) of this Agreement shall be conditioned upon your agreement to sign a
     Release substantially in the form attached hereto as Exhibit A on or within
                                                          ---------
     ten (10) days of your receipt of the Company's written request to do so.
     In the event that you fail to or choose not to sign such Release within the
     time period set forth in the previous sentence, the Company shall have no
     obligation to make such payments or accelerate your options if such
     acceleration otherwise would be required by the terms of the Stock Option
     Agreement relating to the terminations by the Company without Cause or by a
     Constructive Termination.

4.  Benefits and Reimbursement of Expenses.
    ---------------------------------------

     (a) Vacation.  You shall be entitled to four (4) weeks of paid vacation
         --------
     leave per year, which will accrue on a pro rata basis.  Upon termination of
     employment, the Company shall pay you only for earned but unused vacation
     time up to a maximum of four (4) weeks.

     (b) Office Equipment and Services.  You shall also be entitled to have
         -----------------------------
     installed at an office in your home such computer and communications
     equipment and associated services, and you shall be furnished with such
     mobile equipment and associated services, all at Company expense, as are
     reasonably necessary for you to perform your functions whether you are on
     the Company's premises, at home or traveling or at another location, which
     equipment and services shall be subject to upgrade so as at all times to
     constitute state-of-the art computing and communications fixed-site and
     mobile facilities for senior executives at leading information technology
     companies in the United States.  Such equipment and services shall
     initially include at least the equipment and services set forth on Schedule
     A hereto.  Upon the termination of your employment by the Company without
     Cause or by a Constructive Termination or upon the expiration of the Term
     of this Agreement, you shall be entitled to assume any leases or contracts
     for such equipment and services which the Company had been obligated to
     provide, all at your expense following the twelve-month period of continued
     benefits provided for in Section 3(i), during which twelve-month period the
     Company shall continue timely to make all payments therefor; and you shall
     also be entitled at any time after such termination or the expiration of
     the Term of this Agreement and during such twelve-month period to purchase
     at its depreciated value any of such equipment which the Company then owns
     and has previously provided to you.  In the event that you choose not to
     assume such leases or contracts at the end of the twelve-month period, you
     will return all such computer and communications equipment to the Company.

                                      -6-
<PAGE>

     (c) Benefits.  In connection with your employment hereunder, you shall be
         --------
     entitled to participate in any employee benefit plans which the Company
     provides or may establish for the benefit of its senior executive employees
     generally (including, without limitation, any group life, health, dental
     and other insurance plans).

     (d) Reimbursement of Expenses.  You shall be entitled to reimbursement for
         -------------------------
     all ordinary and reasonable out-of-pocket business expenses, including but
     not limited to air travel (which shall be coach class but may be upgraded
     to business class for any flights greater than two hours in duration) and
     hotel accommodations, which are reasonably incurred by you in furtherance
     of the Company's business, and otherwise in accordance with reasonable
     policies adopted from time to time by the Company.

5.  Nondisclosure, Noncompetition, Nonsolicitation and Assignment of Work
    ---------------------------------------------------------------------
    Product.
    --------

     (a)  Protected Information.
          ---------------------

          (i)  During your employment with the Company and for a period of five
          (5) years after termination of such employment, you will not at any
          time, for any reason whatsoever (other than as necessary and proper to
          promote and advance the business of the Company), reveal to any
          person, association or company any confidential information concerning
          the organization, including, but not limited to, information about
          employees; sales and marketing operations; corporate reorganization,
          merger, consolidation; sales or marketing plans and strategies;
          pricing policies; vendor, customer or client lists and accounts; the
          business, finances or financial information, technology, formulae,
          research, development, models, computer programs, designs,
          descriptions, blueprints, data, information, or the existence or
          betterment of possible new uses or applications for any product or
          service, of the Company or of any of its customers, clients, supplies,
          consultants, licensees, or others with which the Company does business
          ("Business Partners") so far as you may have come or may come to know
          of them through your performance of your duties to the Company, except
          (i) as may be required in the ordinary course of performing your
          duties as an employee of the Company, or (ii) as may be disclosed
          generally in the public domain through no fault of yours, or (iii) as
          required by law. You agree that you shall keep secret all such matters
          entrusted to you and shall not use or attempt to use any such
          information in any manner for your private purposes or in any manner
          which may injure or cause loss to the Company, whether directly or
          indirectly.

          (ii) During your employment and at anytime thereafter, you will not at
          any time, for any reason whatsoever (other than as necessary and
          proper to promote and advance the business of the Company), reveal to
          any person, association or company any Trade Secrets/1/ of the
          Company, including but not limited to Trade Secrets regarding Company
          software, customer lists, plans, documents, technology, formulae,
          research, development, models, computer programs, designs,
          descriptions, blueprints, data, or financial or other business
          information except (i) as may be required in the ordinary course of
          performing your duties as an employee of the Company, or (ii) as may
          be disclosed generally in the public domain through no fault of yours,
          or (iii) as required by law. You agree that you shall keep secret all
          such matters entrusted to you and shall not use or attempt to use any
          such information in any manner for your private purposes or in any
          manner which may injure or cause loss to the Company, whether directly
          or indirectly.

--------------------------------
/1//   For the purposes of Section 5, the term "Trade Secrets" shall be given
its broadest interpretation under Virginia law and shall include, but not be
limited to, information, including a formula, pattern, compilation, program,
device, method, technique or process, that: (i) derives independent economic
value, actual or potential, from not being generally known to, and not being
readily ascertainable by proper means by, other persons who can obtain economic
value from its disclosure or use, and (ii) is the subject of efforts that are
reasonable under the circumstances to maintain its secrecy.

                                      -7-
<PAGE>

     (b)  Prohibited Competition.
          -----------------------

          (i) Certain Acknowledgments and Agreements.  You acknowledge and agree
              --------------------------------------
          that another entity will be deemed competitive with the business of
          the Company if the business or any line of business of such entity is
          principally the development of Internet-oriented electronic commerce
          software which has core functionality which is substantially similar
          to the core functionality of the Company's Internet-oriented
          electronic commerce software, and/or the marketing and/or selling of
          such substantially similar software, but not otherwise (such business
          or line of business hereinafter referred to as "Restricted Business,"
          and any such competitive entity hereinafter referred to as a
          "Competitor").  You further acknowledge and agree that, during the
          course of your performing services for the Company, the Company will
          furnish, disclose and otherwise make available to you confidential and
          proprietary information related to the Company's business.  You also
          acknowledge that such confidential and proprietary information has
          been developed and will be developed by the Company through the
          expenditure by the Company of substantial time, effort and money.

          (ii) Covenants Not to Compete.  Except as otherwise provided herein,
               ------------------------
          during the Term and for a period of one (1) year following the
          termination or expiration of your employment with the Company
          (provided that, in the event of the termination of your employment by
          the Company without Cause or by a Constructive Termination, or the
          expiration of the Term occasioned by the Company, you shall have
          received the lump-sum payment provided for in Section 3(d) or Section
          3(g), as applicable):

               (A) for yourself or on behalf of any other person or entity,
               directly or indirectly, either as principal, agent, stockholder,
               employee, consultant, representative or in any other capacity,
               own, manage, operate or control, or be employed by, engage in or
               have a financial interest in any Competitor in any geographic
               area in which the Company is then doing business (the "Restricted
               Territory"), provided that nothing herein shall prohibit you from
                            -------------
               working or otherwise having an interest in a line of business of
               a Competitor that does not constitute Restricted Business, and

               further provided that nothing contained herein shall preclude you
               ---------------------
               from purchasing or owning securities of any Competitor if such
               securities are publicly traded and if your holdings do not exceed
               two (2%) percent of the outstanding voting securities of such
               entity; or

                                      -8-
<PAGE>

               (B) either individually or on behalf of or through any third
               party, directly or indirectly, solicit or attempt to solicit any
               other employee of or consultant to the Company to leave such
               employee's or consultant's employment or consultancy with the
               Company, except that this provision shall not prohibit you from
               soliciting or attempting to solicit any family member to leave
               employment or consultancy with the Company.

     (c)  Assignment of Work Product.
          --------------------------

          (i)  Any and all right of interest that you may develop in any
               designs, inventions, original works of authorship, innovations,
               improvements, developments, modifications, know-how, technology,
               process, management reports, internal reports and memoranda,
               customer lists, marketing plans or pricing policies, whether or
               not patentable ("Employee Work Product"), that you conceived,
               reduced to practice, devised, developed, or incorporated in
               Company products or services, either alone or jointly, or to
               which you otherwise contributed during the term of your
               employment, insofar as it may directly or indirectly relate to or
               arise out of employment with the Company or the use of Company
               resources ("Company Work Product") are the sole, absolute and
               exclusive property of the Company, and you will promptly make a
               complete disclosure of all Company Work Product to the Company.
               You hereby assign to the Company all rights in all Company Work
               Product.

          (ii) You expressly acknowledge and agree that you have disclosed to
               the Company in writing prior to signing this agreement any and
               all designs, inventions, original works of authorship,
               innovations, improvements, developments, modifications, know-how,
               technology, process, management reports, internal reports and
               memoranda, customer lists, marketing plans or pricing policies
               which may be similar to or conceivably could be used in or in
               relation to Company products or services (collectively
               "Intellectual Property").  The Company acknowledges that you are
               the holder of certain inventions which are not assigned to the
               Company and which remain solely your property, including but not
               limited to any thereof held by Convergence, Inc., a Vermont
               corporation owned by you.

               (A)  You agree that you will not incorporate into any work
                    performed for the Company any such Intellectual Property
                    without the express written permission of OneSoft, and, with
                    respect to any Intellectual Property that is incorporated
                    into any work performed for the Company with the Company's
                    express written permission, you hereby grant to the Company
                    a royalty-free, irrevocable license throughout the world to
                    use, disclose, publish, translate, reproduce, deliver,
                    perform, dispose of, and to authorize others so to do, all
                    such Intellectual Property.

               (B)  With respect to any Intellectual Property which you have not
                    disclosed to the Company pursuant to this Section 5(c)(ii)
                    but which is

                                      -9-
<PAGE>

                    incorporated into Company products or services or brought to
                    the Company for use in the Company products or services or
                    which you have disclosed to the Company but incorporated
                    into work performed for the Company without the Company's
                    express written permission, you hereby assign to the Company
                    all rights in all such Intellectual Property in accordance
                    with Section 5(c)(i).

         (iii) At the request and expense of the Company but without charge to
               the Company, you will do all acts and things as may be necessary
               to confirm and vest the entire right, title and interest in the
               Company Work Product in the Company and to secure to the Company
               full protection of the same, including without limitation, the
               execution and delivery of assignments, patent applications and
               other documents or papers, whether during your employment with
               the Company or any time after termination of employment.  In
               order to confirm the Company's rights, you also will assign to
               the Company any and all copyrights and reproduction rights to any
               written material prepared by you in connection with your
               employment.

          (iv) Except as specified in Section 5(c)(ii) and/or materials in the
               public domain, all Employee Work Product furnished by you to the
               Company will be Company Work Product and will not to the best of
               your knowledge or belief violate or infringe upon any right,
               patent, copyright, trademark or right of privacy, or constitute
               libel or slander against or violate any other rights of any
               person, firm or corporation.

     (d)  Works Made For Hire.  All original works of authorship and other such
          -------------------
          Work Product which are made by you (solely or jointly with others)
          within the scope of your employment and which are protectable by
          copyright are "works made for hire," pursuant to United States
          Copyright Act (17 U.S.C. Section 101).

     (e) Reasonableness of Restrictions.  You further recognize and acknowledge
         ------------------------------
     that (i) the types of employment which are prohibited by this Section 5 are
     narrow and reasonable in relation to the skills which represent your
     principal basis of employability with the Company and with other
     prospective employers, and (ii) the temporal and specific but broad
     geographic scope of the provisions of this Section 5 are reasonable,
     legitimate and fair to you, and necessary to protect the legitimate
     interests of the Company.

     (f) Survival of Acknowledgments and Agreements.  Your acknowledgments and
         ------------------------------------------
     agreements set forth in this Section 5 shall survive the expiration or
     termination of this Agreement and the termination of your employment with
     the Company for any reason.

6.  Disclosure to Future Employers.  You agree that you will provide, and that
    -------------------------------
the Company may similarly provide in its discretion, a copy of the covenants
contained in Section 5 of this Agreement to any enterprise which you may,
directly or indirectly, own, manage, operate, finance, join, control or in which
you participate in the ownership (other than ownership of less than 5% of a
publicly traded company), management, operation, financing, or control, or with
which you may be involved as an officer, director, employee, partner, principal,
agent, representative, consultant or otherwise.

                                      -10-
<PAGE>

7.  Records.  Except as provided in Section 4(b) hereof, upon termination of
    --------
your relationship with the Company or the expiration of the Term of this
Agreement, you shall deliver to the Company any property of the Company which
may be in your possession, including products, materials, computer disks,
memoranda, notes, records, reports, or other documents, including but not
limited to all copies of the same.

8.  Indemnification.  During the period of your employment hereunder and
    ----------------
thereafter, the Company will indemnify you in your capacity as an officer,
director or employee of the Company or any Affiliate thereof to the maximum
extent permitted under applicable state law and the Company's By-laws, and,
without limiting the foregoing, the Company will pay and advance (without regard
to your ability to repay such advancement) all attorneys fees and expenses
incurred by you in accordance with Section 145(e) of the Delaware General
Corporation Law.

9.  No Conflicting Agreements.  You hereby represent and warrant that you have
    -------------------------
no commitments or obligations inconsistent with this Agreement and you hereby
agree to indemnify and hold the Company harmless from and against loss, damage,
liability or expense arising from any claim based upon circumstances alleged to
be inconsistent with such representation and warranty.

10.  General.
     --------

     (a) Notices.  All notices, requests, consents and other communications
         -------
     hereunder shall be in writing, shall be addressed to the receiving party's
     address set forth below or to such other address as a party may designate
     by notice hereunder, and shall be either (i) delivered by hand, (ii) sent
     by nationally recognized overnight courier service, (iii) made by facsimile
     transmission, or (iv) sent by registered or certified mail, return receipt
     requested, postage prepaid:

        If to the Company:   OneSoft Corporation
                             1505 Farm Credit Drive
                             McLean, VA 22102
                             Attn:  Chairman of the Board

        with a copy to:      Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.
                             One Financial Center
                             Boston, MA 02111
                             Attn:  Robert M. Gault, Esquire

        If to you:           James W. MacIntyre, IV

        With a copy to:      George F. Albright, Jr.
                             Shaw Pittman
                             1676 International Drive
                             McLean, VA 22102

                                      -11-
<PAGE>

     All notices, requests, consents and other communications hereunder shall be
     deemed to have been given either (i) if by hand, at the time of the
     delivery thereof to the receiving party at the address of such party set
     forth above, (ii) if sent by overnight courier, on the next business day
     following the day such notice is delivered to the courier service, or (iii)
     if sent by registered mail, on the fifth business day following the day
     such mailing is made.

     (b) Entire Agreement.  This Agreement embodies the entire agreement and
         ----------------
     understanding between the parties hereto with respect to the subject matter
     hereof and supersedes all prior or contemporaneous oral or written
     agreements and understandings relating to the subject matter hereof.  No
     statement, representation, warranty, covenant or agreement of any kind not
     expressly set forth in this Agreement shall affect, or be used to
     interpret, change or restrict, the express terms and provisions of this
     Agreement.

     (c) Modifications and Amendments.  The terms and provisions of this
         ----------------------------
     Agreement may be modified or amended only by written agreement executed by
     the parties hereto.

     (d) Waivers and Consents.  The terms and provisions of this Agreement may
         --------------------
     be waived, or consent for the departure therefrom granted, only by written
     document executed by the party entitled to the benefits of such terms or
     provisions.  No such waiver or consent shall be deemed to be or shall
     constitute a waiver or consent with respect to any other terms or
     provisions of this Agreement, whether or not similar.  Each such waiver or
     consent shall be effective only in the specific instance and for the
     purpose for which it was given, and shall not constitute a continuing
     waiver or consent.

     (e) Parties.  This Agreement is personal and shall in no way be subject to
         -------
     assignment by you except as contemplated hereby.  This Agreement shall be
     binding upon and shall inure to the benefit of the Company and its
     successors and assigns either by merger, operation of law, consolidation,
     assignment, purchase or other acquisition of a controlling interest in the
     business of the Company, and shall be binding upon and shall inure to your
     benefit and that of your heirs, executors, administrators, personal and
     legal representatives, distributees, devisees, legatees, successors and
     permitted assigns.  If you should die while any amounts would still be
     payable to you hereunder (other than amounts to which you would be entitled
     by reason of continued employment), all such amounts, unless otherwise
     provided herein, shall be paid in accordance with the terms of this
     Agreement to your devisees, legatees or other designee or, if there be no
     such designee, to your estate.  The Company agrees that a successor in
     interest by merger, operation of law, consolidation, assignment, purchase
     or other acquisition of a controlling interest in the business of the
     Company will be informed prior to such event of the existence of this
     Agreement.  The Company shall require any such successor (whether direct or
     indirect, by purchase, merger, operation of law, consolidation, assignment
     or otherwise of a controlling interest in the business, stock or other
     assets of the Company) to assume expressly and agree to perform this
     Agreement.

     (f) Governing Law.  This Agreement and the rights and obligations of the
         -------------
     parties hereunder shall be construed in accordance with and governed by the
     law of the Commonwealth of Virginia, without giving effect to the conflict
     of law principles thereof.

                                      -12-
<PAGE>

     (g) Dispute Resolution.  Any dispute arising with respect to this Agreement
         ------------------
     shall be submitted to arbitration in the greater Washington, D.C.
     metropolitan area under the rules of the American Arbitration Association
     (the "AAA") before a single arbitrator jointly selected by the parties or,
     if they shall not have agreed on an arbitrator within (10) days after
     receipt by one of them of written notice from the other of the existence of
     a dispute, a single arbitrator selected by the AAA in accordance with its
     rules. The decision of the arbitrator shall be final and binding on the
     parties. Each party hereto shall pay its or their own expenses incident to
     the negotiation, preparation and resolution of any controversy or claim
     arising out of, or related to, this Agreement, or the breach thereof,
     provided, however, the Company shall pay and be solely responsible for any
     attorneys' fees and expenses and court or arbitration costs incurred by the
     Employee as a result of a claim that the Company has breached or otherwise
     failed to perform this Agreement or any provision hereof to be performed by
     the Company if the Employee prevails in the contest in whole or in part.

     (h) Severability.  In the event that any arbitrator or court of competent
         ------------
     jurisdiction shall determine that any provision, or any portion thereof,
     contained in this Agreement shall be invalid or unenforceable in any
     respect, then such provision shall be deemed limited to the extent that
     such arbitrator or court deems it valid and enforceable, and as so limited
     shall remain in full force and effect.  In the event that such arbitrator
     or court shall deem any such provision, or portion thereof, wholly invalid
     or unenforceable, the remaining provisions, or portions of such provision,
     of this Agreement shall nevertheless remain in full force and effect.

     (i) No Waiver of Rights, Powers and Remedies.  No failure or delay by a
         ----------------------------------------
     party hereto in exercising any right, power or remedy under this Agreement,
     and no course of dealing between the parties hereto, shall operate as a
     waiver of any such right, power or remedy of the party.  No single or
     partial exercise of any right, power or remedy under this Agreement by a
     party hereto, nor any abandonment or discontinuance of steps to enforce any
     such right, power or remedy, shall preclude such party from any other or
     further exercise thereof or the exercise of any other right, power or
     remedy hereunder.  The election of any remedy by a party hereto shall not
     constitute a waiver of the right of such party to pursue other available
     remedies.  No notice to or demand on a party not expressly required under
     this Agreement shall entitle the party receiving such notice or demand to
     any other or further notice or demand in similar or other circumstances or
     constitute a waiver of the rights of the party giving such notice or demand
     to any other or further action in any circumstances without such notice or
     demand.

     (j) Interpretation.  The parties hereto acknowledge and agree that: (i)
         --------------
     each party and its or his counsel reviewed and negotiated the terms and
     provisions of this Agreement  and have contributed to its revision; (ii)
     the rule of construction to the effect that any ambiguities are resolved
     against the drafting party shall not be employed in the interpretation of
     this Agreement; and (iii) the terms and provisions of this Agreement shall
     be construed fairly as to all parties hereto and not in favor of or against
     any party, regardless of which party was generally responsible for the
     preparation of this Agreement.

     (k) Counterparts.  This Agreement may be executed in one or more
         ------------
     counterparts, and by different parties hereto on separate counterparts,
     each of which shall be deemed an original, but all of which together shall
     constitute one and the same instrument.

                                      -13-
<PAGE>

If the foregoing accurately sets forth our agreement, please so indicate by
signing and returning to us the enclosed copy of this letter, whereupon this
letter shall become a binding agreement between us, under seal, as of the date
first written above.

                                    Very truly yours,

                                    ONESOFT CORPORATION

                                    By: /s/ Paul D. Economon
                                        --------------------
                                        Paul D. Economon
                                        Corporate Secretary and General Counsel

ACCEPTED AND AGREED TO:

/s/ James W. MacIntyre, IV
--------------------------
James W. MacIntyre, IV

3/7/2000
--------------------------
Date

                                      -14-
<PAGE>

                                   EXHIBIT A
                                   ---------

                                    RELEASE

In consideration of the payments ("Severance Pay") to be made by OneSoft
Corporation (the "Company") pursuant to Section 3 of my Employment Agreement
which I entered into with the Company on ________________ __, 2000, I, James
MacIntyre, IV, hereby agree and acknowledge as follows:

I hereby waive my right to assert any form of legal claim against the Company/2/
whatsoever for any alleged action, inaction or circumstance existing or arising
from the beginning of time through ________________(the "Separation Date").  My
waiver and release herein is intended to bar any form of legal claim, charge,
complaint or any other form of action (jointly referred to as "Claims") against
the Company seeking any form of relief including, without limitation, equitable
relief (whether declaratory, injunctive or otherwise), the recovery of any
damages or any other form of monetary recovery whatsoever (including, without
limitation, back pay, front pay, compensatory damages, emotional distress
damages, punitive damages, attorneys fees and any other costs) against the
Company, for any alleged action, inaction or circumstance existing or arising
through the "Separation Date".

Without limiting the foregoing general waiver and release, I specifically
release the Company from and waive my right to bring any Claim arising from or
related to my employment relationship with the Company or the termination
thereof, including, without limitation:

     **   Claims under any state or federal discrimination, fair employment
     practices or other employment related statute, regulation or executive
     order (as they may have been amended through the Change in Status Date)
     prohibiting discrimination or harassment based upon any protected status
     including, without limitation, race, national origin, age, gender, marital
     status, disability, veteran status or sexual orientation.  Without
     limitation, specifically included in this paragraph are any Claims arising
     under the federal Age Discrimination in Employment Act, the Older Workers
     Benefit Protection Act, the Civil Rights Acts of 1866 and 1871, Title VII
     of the Civil Rights Act of 1964, the Civil Rights Act of 1991, the Equal
     Pay Act, the Americans With Disabilities Act and any similar Virginia or
     other state statute.

     **  Claims under any other state or federal employment related statute,
     regulation or executive order (as they may have been amended through the
     Separation Date) relating to wages, hours or any other terms and conditions
     of employment.  Without limitation, specifically included in this paragraph
     are any Claims arising under the Fair Labor Standards Act, the Family and
     Medical Leave Act of 1993, the National Labor Relations Act, the
     Consolidated Omnibus Budget Reconciliation Act of 1985 (COBRA) and any
     similar Virginia or other state statute.  Also included in this paragraph
     are Claims arising under the Employee Retirement Income Security Act of
     1974 except to the extent that I am not aware of a dispute with respect to
     such Claim and could not reasonably be aware of a dispute with respect to
     such Claim as of the date of execution of this Release.

-----------------------------
/2/ For the purposes of this Release, the parties agree that the term "Company"
shall include OneSoft Corporation, its divisions, affiliates, parents and
subsidiaries, and its and their respective officers, directors, employees,
agents and assigns.

                                      -15-
<PAGE>

     **  Claims under any state or federal common law theory including, without
     limitation, wrongful discharge, breach of express or implied contract,
     promissory estoppel, unjust enrichment, breach of a covenant of good faith
     and fair dealing, violation of public policy, defamation, interference with
     contractual relations, intentional or negligent infliction of emotional
     distress, invasion of privacy, misrepresentation, deceit, fraud or
     negligence.

     **  Any other Claim arising under local, state or federal law.

     The foregoing release does not release the Company from its obligation to
     indemnify me in accordance with Section 8 of the Employment Agreement.

Signed this __ day of ___________, 20__,

___________________________________
James MacIntyre, IV

                                      -16-

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