Document:

<PAGE>

                                                                    EXHIBIT 10.5

September 27, 1996

Mr Randall V. Pevin

Dear Randy:

I am pleased to offer you a position as a Customer Support Representative for
Global Exchange, Inc. (GXI) beginning October 1, 1996.  Your time will be
compensated at the rate of $14.42 per hour (annualized salary of $30,000) during
a 90 day probation period, and afterwards you will be compensated at the rate of
$15.32 per hour (annualized salary of $32,000) as earned, paid in bi-weekly
payments of 40 hours each week.  You will receive a performance review after six
months and then again on your one-year anniversary.  As a salaried staff member
with full benefits, you will be exempt from any overtime payment, but you will
be able to participate in all incentive programs of Global Exchange, Inc.

As a salaried employee you will be paid for 8 holidays, 80 hours of vacation,
earned at the rate of 3.0 hours per pay period and 40 hours of sick leave earned
the rate of 1.5 hours per pay period.  Within two months of your employment date
(or such effective date as determined by GXI's insurance carrier), you will be
provided medical, hospitalization, and disability insurance coverage through
GXI's group insurance plan.  A term life insurance policy is provided in the
amount of twice your annual salary within two months of your start date.  GXI's
insurance coverage is subject to approval and acceptance by GXI's Group
Insurance Carriers.  Should they deny your application for coverage under our
group policy, GXI would, accordingly, be unable to offer you insurance benefits.
If insurance rates for employees are over and above standard premium amounts,
employees will be expected to pay the difference.  Currently, GXI pays 100
percent of insurance premiums.  Depending on the escalation of GXI's insurance
rates, you may be asked to pay a portion of the insurance at some future date.
GXI provides worker's compensation insurance and reimburses work-related
expenses as you incur them and file expense reports with appropriate receipts.

You should understand that this employment at GXI is for an indefinite period of
time and that salary payments, benefits, and working conditions could change
from time-to-time or any time.  As a condition of employment, you will need to
sign the attached GXI Ethics Policy.  If the terms and conditions of employment
are acceptable to you, please sign below and return the original letter.

We would be delighted to have you as a member of our professional staff.

Sincerely,

/s/ William L. Robertson
<PAGE>

William L. Robertson
Chief Executive Officer

/s/ Randall Pevin
-----------------

###-##-####
-----------------
SS#
<PAGE>

                                                       May 5, 1997

Mr. Randall V. Pevin

Dear Mr. Pevin:

     This letter sets forth in writing the terms of the agreement between you
(the "Employee") and GXI, Incorporated, a Delaware corporation (the "Company",
which term shall include any subsidiaries and affiliates of GXI, Incorporated).

     The Company and the Employee hereby acknowledge the following:  (i) The
Company is currently engaged in all phases of the business of researching,
developing, owning, marketing, licensing and distributing Internet-related
computer software and providing related consulting services to its clients,
including its ForSite Extranet software; (ii) The Company has developed
significant reputation and goodwill in its industry throughout the United States
and abroad; (iii) The success of the Company's business depends upon the
continued confidentiality of its proprietary information and trade secrets; (iv)
The Employee is or will be employed by the Company in a position of trust and
confidence and in a capacity in which he has or will become familiar with the
Company's confidential information and trade secrets; (v) In the course of his
employment or through the use of Company facilities or resources, the Employee
may have or may in the future have contributed to the development of Company
trade secrets and confidential business information; and (vi) The Company and
the Employee are entering into this agreement in consideration of the employment
or continued employment of Employee, the granting of bonuses, raises or stock
options, if applicable, other good and valuable consideration, and to further
document Company policies now in effect.

     In consideration of the foregoing acknowledgments and the agreements set
forth herein, the Employee and the Company hereby agree as follows:

     1.   The Employee will make full and prompt written disclosure to the
Company of all inventions, innovations, improvements, modifications, know-how,
discoveries and developments (the "Developments"), whether or not patentable or
copyrightable, which are conceived, made or discovered by or under the direction
of the Employee, alone or jointly with others, during the course of his
employment with the Company or as a direct or indirect result thereof, including
those made or discovered during normal working hours, on the premises of the
Company, or using Company resources, and including Developments suggested by any
work or services performed or to be performed by the Employee for the Company.
The Developments will be the sole, absolute and exclusive property of the
Company, including any copyrights and patent rights in the Developments, and
Employee hereby assigns all rights in the Developments to Company.
<PAGE>

     2.   All Developments devised, made, developed or perfected after
termination of the Employee's employment are within the provisions of Paragraph
1 if conceived in whole or material part during the period of employment or with
the use of Company resources or facilities.

     3.   At the request and expense of the Company but without charge to the
Company, the Employee will do all acts and things as may be necessary to confirm
and vest the entire right, title and interest in the Developments in the Company
and 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. In order to confirm the Company's rights, the
Employee will also assign to the Company any and all copyrights and reproduction
rights to any written material prepared by the Employee in connection with his
employment.

     4.   All Developments furnished by the Employee to the Company will be the
Employee's own and original creation except for materials in the public domain
and will not to the best of his 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.

     5.   During the Employee's period of employment with the Company and after
the voluntary or involuntary termination of such employment, whether initiated
by the Employee or the Company, the Employee will hold in the strictest
confidence and will not, without the express written authority of the Company,
directly or indirectly disclose to others, disseminate, use or publish, other
than use in the ordinary course of the Company's business, any proprietary,
secret or confidential information of the Company (which for the purposes hereof
shall include without limitation the Developments, information designated by the
Company as "proprietary," "secret," or "confidential" (or similarly designated)
and information which is not generally known to those outside of the Company),
including but not limited to any such information concerning: (a) the business
or operations of the Company or any of its clients, suppliers, customers,
consultants, licensees, or others with which it does business ("Business
Partners"), (b) any Company or Business Partner materials, apparatus, processes,
methods, ways of business, formulae, technology, research, development, customer
lists, customer requirements, supplier lists, models, computer programs, program
descriptions, flow charts, equipment designs, equipment descriptions,
documentation, records, books, technical information, blueprints, databases, or
data, or (c) the existence or betterment of, or possible new uses or
applications for, any Company or Business Partner product or service
(Collectively, "Confidential Information").

     6.   Upon the cessation of the Employee's employment by the Company for any
reason, he shall not take from, and will promptly return to the Company, any and
all Confidential Information and any writings or documents whatever or
reproductions thereof and any and all other information of a proprietary, secret
or confidential nature which relate in any way to the Company's operations,
business, assets, research, development, and any of the other items covered by
paragraph 5 above then in Employee's possession or control.

                                      -2-
<PAGE>

     7.   The Employee represents and warrants to the Company as follows: (i) he
is not under any obligation to any person which is inconsistent or in conflict
with this letter agreement or which would prevent, limit or impair in any way
the performance of his obligations hereunder; and (ii) he has not disclosed and
will not disclose to the Company, nor use for the Company's benefit, any
confidential information or trade secrets of any prior employer or principal,
unless and until such confidential information and trade secrets have become
public knowledge without the Employee's participation, or unless such disclosure
is permitted by any agreement with such prior employer or principal.

     8.   The Employee agrees that during the term of his employment with the
Company and for a period of one (1) year after the date of any voluntary or
involuntary termination of such employment, whether initiated by the Company or
the Employee, he will not: (a) directly or indirectly, either as principal,
agent, employee, consultant, officer, director, stockholder, or in any other
capacity, engage in or have a financial interest in, any business which is
competitive with the business of the Company or any of its subsidiaries or
affiliates, (b) induce employees of the Company or any of its subsidiaries or
affiliates to join with him in any capacity, direct or indirect, in any business
in which he may be or become interested whether or not competitive with the
Company, or (c) solicit customers of the Company in competition with the
Company. Notwithstanding Section 8(a), the Employee may continue to hold or
purchase at prevailing publicly traded rates not more than one percent (1%) of
the outstanding and issued shares of any publicly traded company which is
competitive with the business of the Company or any of its subsidiaries or
affiliates.

     Without limiting the generality of the foregoing, a business will be deemed
competitive or in competition with the Company if it involves the performing of
services and/or the research, development, production, manufacture, marketing,
distribution, licensing, or sale of any product which is or is intended to be
directly or indirectly competitive with or similar to services performed and
products being researched, developed, produced, manufactured, marketed,
distributed, licensed or sold by the Company at any time during the Employee's
employment.

     9.   This letter agreement does not bind the Employee or the Company to any
specified period of employment, such employment being at the will of both the
Company and the Employee unless otherwise agreed in writing; and the voluntary
or involuntary termination of the Employee's employment shall not affect the
obligations of the Employee and the Company hereunder.

     10.  The Employee acknowledges that should he breach any of the covenants
set forth in this letter, monetary damages would not provide the Company with an
adequate remedy for such breach, and he hereby consents in addition to any
monetary award to the entry of an order in any court of competent jurisdiction
enjoining any activity constituting such a breach and requiring specific
performance of his obligations hereunder.

                                      -3-
<PAGE>

     11.  If any portion or provision of this letter agreement should be
determined by a court of competent jurisdiction to be invalid or unenforceable,
then this letter agreement is intended to and shall be valid and enforced to the
fullest extent permitted by law.

     12.  Nothing contained in this letter agreement shall refer to or affect
any condition of employment or other item not specifically mentioned herein.
This letter agreement shall be construed in accordance with and governed by the
laws of the Commonwealth of Virginia, and shall inure to the benefit of and be
binding upon the heirs, executors, administrators, personal representatives and
assigns of the Employee and upon the legal representatives, successors and
assigns of the Company. The Employee agrees to jurisdiction and venue in the
federal and state courts within the Commonwealth of Virginia for all disputes
and enforcement actions arising under this Agreement.

     Please indicate your acceptance of the terms of this letter agreement by
signing in the place provided below, whereupon this letter agreement shall take
effect as an instrument under seal.

                                             Very truly yours,

                                             /s/ James W. MacIntyre, IV

                                             Global Exchange, Incorporated
                                             By:  James W. MacIntyre IV
                                                  CEO & President

Agreed to as of the date
on page 1 of this letter agreement.

/s/ Randall V. Pevin
----------------------------------
Randall V. Pevin

                                      -4-<PAGE>

                                                                    EXHIBIT 10.6

                               Employment Offer

Thomas E. Young

Dear Mr. Young:

I am pleased to provide you with this offer setting forth the proposed terms and
conditions of your employment by OneSoft, Corporation (OneSoft).

1.   Position.  Your position will be as Senior Vice President, reporting to the
     --------
     President.  Initially, you will be working in OneSoft's offices located at
     7010 Little River Turnpike, Annandale, Virginia 22003.

2.   Starting Date/Nature of Relationship. It is expected that your employment
     ------------------------------------
     will start as of May 3, 1999 (placeholder). No provision of this letter
     shall be construed to create an express or implied employment contract for
     a specific period of time. Your employment will be at will, which means
     that either you or OneSoft may terminate the employment relationship at any
     time and for any reason.

3.   Salary.  Your initial salary will be at the rate of $12,500.00 per month,
     ------
     which annualized is $150,000.00. Total first year compensation package (to
     compensate for your loan) at 100% of Variable Compensation Plan is targeted
     at $305,000.00. Compensation for subsequent years will target $275,000.00
     at 100% of Variable Compensation Plan. Such salary shall be paid in
     conformance with OneSoft's customary payroll practices as established or
     modified from time to time. The MBOs driving the variable component of your
     compensation will be mutually agreed upon between you and Jim MacIntyre. In
     addition, OneSoft will grant you an interest free loan in the amount of
     $30,000.00. This loan will be paid back from earned bonuses over a twenty-
     four month period of time. $15,000.00 of which will be paid back within the
     first twelve months after receipt of the loan. Salaries are currently paid
     in bi-weekly installments and in arrears.

4.   Incentive Stock Options.  Subject to the approval of the Board of
     -----------------------
     Directors, you will be eligible to receive an option to purchase OneSoft
     Common Stock. You will be eligible to receive an Incentive Stock Option
     Agreement to purchase two hundred thousand (200,000) shares of OneSoft
     Common Stock, vesting over a three year schedule. The vesting schedule is
     as follows: On your first, second and third anniversary, you will vest 33%
     of your options. The exercise price for the optioned OneSoft Common Stock
     will be the fair market value of the Common Stock as determined by the
     Board of Directors, at the time that the Board approves your options. The
     incentive stock options will be subject to the restrictions set forth in
     OneSoft's 1997 Employee, consultant and Director Stock Option Plan and the
     Incentive Stock Option Agreement representing this option.

5.   Benefits.  As a salaried employee you will be paid for 8 holidays, vacation
     --------
     commensurate with other OneSoft executives, and one week of sick leave
     earned at the rate of 1.5 hours per pay period. Within two months of your
     employment date (or such effective date as determined by OneSoft's
     insurance carrier), you will be provided medical, hospitalization, dental
     and disability insurance coverage through OneSoft's group insurance plans.
     A term life insurance policy is provided in the amount of twice your annual
     salary within two months of your start date. OneSoft's insurance coverage
     is subject to approval and acceptance by OneSoft's Group Insurance Carriers
     and subject to the terms of its policies. Should they deny your application
     for coverage under our group policy, OneSoft would, accordingly, be unable
     to offer you insurance benefits. If insurance rates for employees are over
     and above standard premium amounts, employees will be expected to pay the
     difference.
<PAGE>

     Currently OneSoft pays 100 percent of insurance premiums. Depending on the
     escalation of OneSoft's insurance rates, you may be asked to pay a portion
     of the Insurance at some future date. OneSoft provides worker's
     compensation insurance and reimburses work-related expenses as you incur
     them and file expense reports with appropriate receipts.

     OneSoft retains the right to change, add or cease any particular benefit.

6.   Confidentiality and Noncompetition.  As a condition of employment with
     ----------------------------------
     OneSoft, you and OneSoft will become parties to an Employee Non-Disclosure,
     Noncompetition and Developments Agreement substantially in the form
     presented with this letter (the "Employee Agreement").

7.   General. This letter, together with the Confidential Information and
     -------
     Developments Agreement, will constitute our entire agreement as to your
     employment by OneSoft and will supersede any prior agreements or
     understandings, whether in writing or oral. This agreement may only be
     amended or modified in a writing signed by both you and OneSoft.

     The headings in this letter are for convenience of reference only; they are
     not intended to modify or affect the meaning of any of the terms in this
     letter.

     This letter agreement shall be construed in accordance with and governed by
     the laws of the Commonwealth of Virginia, without giving effect to its
     conflict of law provisions, and shall inure to the benefit of and be
     binding upon the heirs, executors, administrators, personal representatives
     and assigns of the Employee and upon the legal representatives, successors
     and assigns of the Company. The Employee agrees to jurisdiction and venue
     in the federal and state courts within the Commonwealth of Virginia for all
     disputes and enforcement actions arising under this Agreement. Any such
     dispute or action shall be heard by a judge sitting without a jury, and
     both parties forever waive their right to a civil jury trial with respect
     thereto.

     Please acknowledge your acceptance of this offer of employment and the
     terms and conditions thereof by signing this letter and the Employee
     Agreement, which execution will evidence your agreement with the terms and
     conditions set forth herein and therein, and returning the originals to
     OneSoft.

     This offer of employment will expire on March 31, 1999 unless accepted by
     you prior to such date.

                              Sincerely,

                              ONESOFT, CORPORATION

                              By: /s/ Randall V. Pevin
                                  ---------------------------------
                                  Randall V. Pevin,
                                  Vice President, Operations

ACCEPTED AND AGREED
-------------------

/s/ Thomas E. Young
-------------------
Thomas E. Young

                                       2
<PAGE>

              Confidential Information and Developments Agreement

Thomas E. Young

Dear Mr. Young:

     This letter sets forth the terms of the agreement between you (the
"Employee") and OneSoft, Corporation., a Delaware corporation (the "Company",
which term shall include any subsidiaries and affiliates of OneSoft,
Corporation) regarding confidential information and developments.

     The Company and the Employee hereby acknowledge the following: (i) The
Company is currently engaged in all phases of the business of researching,
developing, owning, marketing, licensing and distributing Internet-related
computer software and providing related consulting services to its client,
including its OneCommerce software; (ii) The Company has developed significant
reputation and goodwill in its industry throughout the United States and abroad;
(iii) The success of the Company's business depends upon the continued
confidentiality of its proprietary information and trade secrets; (iv) The
Employee is or will be employed by the Company in a position of trust and
confidence and in a capacity in which he has or will become familiar with the
Company's confidential information and trade secrets; (v) In the course of his
employment or through the use of Company facilities or resources, the Employee
may have or may in the future have contributed to the development of Company
trade secrets and confidential business information; and (vi) The Company and
the Employee are entering into this agreement in consideration of the employment
or continued employment of Employee, the granting of bonuses, raises or stock
options, if applicable, other good and valuable consideration, and to further
document Company policies now in effect.

     In consideration of the foregoing acknowledgments and the agreements set
forth herein, the Employee and the Company hereby agree as follows:

     1. The Employee will make full and prompt written disclosure to the Company
of all inventions, innovations, improvements, modifications, know-how,
discoveries and developments (the "Developments"), whether or not patentable or
copyrightable, which are conceived, made or discovered by or under the direction
of the Employee, alone or jointly with others, during the course of his
employment with the Company or as a direct or indirect result thereof, including
those made or discovered during normal working hours, on the premises of the
Company, or using Company resources, and including Developments suggested by any
work or services performed or to be performed by the Employee for the Company.
The Developments will be the sole, absolute and exclusive property of the
Company, including any copyrights and patent rights in the Developments, and
Employee hereby assigns all rights in the Developments to Company.
<PAGE>

     2.  All Developments devised, made, developed or perfected after
termination of the Employee's employment are within the provisions of Paragraph
1 if conceived in whole or material during the period of employment or with the
use of Company resources or facilities.

     3.  At the request and expense of the Company but without charge to the
Company, the Employee will do all acts and things as may be necessary to confirm
and vest the entire right, title and interest in the Developments in the Company
and 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.  In order to confirm the Company's rights, the
Employee will also assign to the Company any and all copyrights and reproduction
rights to any written material prepared by the Employee in connection with his
employment.

     4.  All Developments furnished by the Employee to the Company will be the
Employee's own and original creation except for materials in the public domain
and will not to the best of his 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.

     5.  During the Employee's period of employment with the Company and after
the voluntary or involuntary termination of such employment, whether initiated
by the Employee or the Company, the Employee will hold in the strictest
confidence and will not, without the express written authority of the Company
directly or indirectly disclose to others, disseminate, use or publish, other
than use in the ordinary course of the Company's business, any proprietary,
secret or confidential information of the Company (which for the purposes hereof
shall include without limitation the Developments, information designated by the
Company as "proprietary," "secret," or "confidential" (or similarly designated)
and information which is not generally known to those outside of the Company),
including but not limited to any such information concerning:  (a) the business
or operations of the Company or any of its clients, suppliers, customers,
consultants, licensees, or others with which it does business ("Business
Partners"), (b) any Company or Business Partner materials, apparatus, processes,
methods, ways of business, formulae, technology, research, development, customer
lists, customer requirements, supplier lists, models, computer programs, program
descriptions, flow charts, equipment designs, equipment descriptions,
documentation, records, books, technical information, blueprints, databases, or
data, or (c) the existence or betterment of, or possible new uses or
applications for, any Company or Business Partner product or service
(Collectively, "Confidential Information").

     6.  Upon the cessation of the Employee's employment by the Company for any
reason, he shall not take from, and will promptly return to the Company, any and
all Confidential Information and any writings or documents whatever or
reproductions thereof and any and all other information of a proprietary, secret
or confidential nature which relate in any way to the Company's operations,
business, assets, research development, and any of the other items covered by
paragraph 5 above them in Employee's possession or control.

     7.  The Employee represents and warrants to the Company as follows:  (i) he
is not under any obligation to any person which is inconsistent or in conflict
with this letter agreement or which would prevent, limit or impair in any way
the performance of his obligations hereunder;
<PAGE>

and (ii) he has not disclosed and will not disclose to the Company, nor use for
the Company's benefit, any confidential information or trade secrets of any
prior employer or principal, unless and until such confidential information and
trade secrets have become public knowledge without the Employee's participation,
or unless such disclosure is permitted by any agreement with such prior employer
or principal.

     8. The Employee agrees that during the term of his employment with the
Company he will not: (a) directly or indirectly, either as principal, agent,
employee, consultant, officer, director, stockholder, or in any other capacity,
engage in or have a financial interest in, any business which is competitive
with the business of the Company or any of its subsidiaries or affiliates, (b)
induce employees of the Company or any of its subsidiaries or affiliates to join
with him in any capacity, direct or indirect, in any business in which he may be
or become interested whether or not competitive with the Company, or (c) solicit
customers of the Company on behalf of himself or anyone else in competition with
the Company. Notwithstanding Section 8(a), the Employee may continue to hold or
purchase at prevailing publicly traded rates not more than one percent (1%) of
the outstanding and issued shares of any publicly traded company which is
competitive with the business of the Company or any of its subsidiaries or
affiliates.

     Without limiting the generality of the foregoing, a business will be deemed
competitive or in competition with the Company if it involves the performing of
services and/or the research, development, production, manufacture, marketing,
distribution, licensing, or sale of any product which is or is intended to be
directly or indirectly competitive with or similar to services performed and
products being researched, developed, produced, manufactured, marketed,
distributed, licensed or sold by the Company at any time during the Employee's
employment.

     9.  This letter agreement does not bind the Employee or the Company to any
specified period of employment, such employment being at the will of both the
Company and the Employee unless otherwise agreed in writing; and the voluntary
or involuntary termination of the Employee's employment shall not affect the
obligations of the Employee and the Company hereunder.

     10.  The Employee acknowledges that should he breach any of the covenants
set forth in this letter, monetary damages would not provide the Company with an
adequate remedy for such breach, and he hereby consents in addition to any
monetary award to the entry of an order in any court of competent jurisdiction
enjoining any activity constituting such a breach and requiring specific
performance of his obligations hereunder.

     11.  If any portion or provision of this letter agreement should be
determined by a court of competent jurisdiction to be invalid or unenforceable,
then this letter agreement is intended to and shall be valid and enforced to the
fullest extent permitted by law.

     12.  Nothing contained in this letter agreement shall refer to or affect
any condition of employment or other item not specifically mentioned herein.
This letter agreement shall be construed in accordance with and governed by the
laws of the Commonwealth of Virginia, without giving effect to its conflict of
law provisions, and shall inure to the benefit of and be binding upon the heirs,
executors, administrators, personal representatives and assigns of the
<PAGE>

Employee and upon the legal representatives, successors and assigns of the
Company. The Employee agrees to jurisdiction and venue in the federal and state
courts within the Commonwealth of Virginia for all disputes and enforcement
actions arising under this Agreement. Any such dispute or action shall be heard
by a judge sitting without a jury, and both parties forever waive their right to
a civil jury trial with respect thereto.

     Please indicate your acceptance of the terms of this agreement by signing
in the place provided below, whereupon this letter agreement shall take effect
as an instrument under seal.

                                        Sincerely,

                                        ONESOFT CORPORATION

                                        By: /s/ Randall V. Pevin
                                            --------------------
                                         Randall V. Pevin
                                         Vice President, Operations

ACCEPTED AND AGREED:
-------------------

/s/ Thomas E. Young
------------------------
Thomas E Young

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