Document:

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                                                                   Exhibit 10.11

January 30, 1997

Mr. Macdonald Clark
Alamo Rent A Car, Inc.
110 SE 6th Street
Fort Lauderdale, FL 33301

Dear Macdonald:

This letter will confirm our supplemental understanding with respect to your
employment. This document will serve as an addendum and modification to your
letter agreement dated December 31, 1996, which letter agreement is incorporated
herein by reference.

First, by signing this supplemental agreement, you authorize the use and
publication by Alamo Rent-A-Car, Inc. ("Alamo"), its affiliated entities, and
their successors and assigns (collectively "the Company") of your name,
signature, voice, and any photographs, videos, or other likenesses of you, and
any other aspects of your personality, in any commercial manner that the Company
may choose, without any additional compensation payable to you, and without the
need for prior inspection or approval by you. By signing below, you release the
Company and all persons acting under its permission or authority, from any
liability in connection with any use or publication under this provision.

Second, you acknowledge that you owe your full time and attention to the
business and operations of Alamo. You agree, during your employment with Alamo,
that you will not commit yourself to any outside activity -- whether orally or
in writing, whether business- or civic-related, and without regard to whether
you are to be compensated for such activity -- that will involve a significant
commitment of your time (to be determined within the reasonable discretion of
Alamo), without first advising and obtaining the written consent of the Chief
Executive Officer of Alamo.

Third, with respect to the "Salary Continuation" section of your letter
agreement, the letter agreement is amended in the following respects. If you die
during the period in which these salary continuation payments would otherwise be
payable, then the payments will be made to your spouse so long as she is living
during the applicable period. Also, during any period in which you are (or, but
for your death, would otherwise be) eligible for salary continuation payments,
Alamo will continue to make available to you and your eligible dependents, at
your and their own expense, health insurance coverage providing the same
benefits as those provided to Alamo employees generally.

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By signing below, you acknowledge and agree that the consideration payable to
you under the letter agreement of December 31, 1996, and your continued
employment with Alamo, is full and adequate consideration for the promises
contained herein.

Please confirm this supplemental agreement by signing in the space provided and
returning one original copy to me.

Sincerely,<PAGE>   1
                                                                   EXHIBIT 10.1

                         EXECUTIVE EMPLOYMENT AGREEMENT

THIS EXECUTIVE EMPLOYMENT AGREEMENT ("Agreement") is effective as of the 19th
day of January, 2000 ("Effective Date"), and is entered into this 1st day of
March, 2000, by and between HARBINGER CORPORATION ("Company"), a Georgia
corporation, and JAMES M. TRAVERS ("Employee"), an individual. For and in
consideration of the mutual covenants described below, the parties hereby agree
as follows:

1.   EMPLOYMENT. Company agrees to employ or continue to employ Employee, and
Employee agrees to accept and continue such employment, upon the following
terms and conditions.

2.   DUTIES.

     a. Employee shall assume the responsibilities and perform the duties
specified in EXHIBIT A ("Duties"). Employee agrees to devote reasonable work
time and energy to the furtherance of the business of Company consistent with
the Duties and shall not during the term hereof work or perform services in any
advisory or other capacity (other than as a member of the Board of Directors or
Board of Advisors of an entity which is not competitive with the Company) for
any individual, firm, company, or corporation other than for Company without
Company's prior written consent.

     b. Employee shall serve on the Company's Board of Directors (the "Board")
if elected by the Company's shareholders to serve in such capacity.

     c. This Agreement may be supplemented from time to time by rules and
regulations of employment issued by Company, including, without limitation,
such rules and regulations described in the Company employee handbook, and
Employee agrees to adhere to these rules and regulations.

3.   COMPENSATION.

     A. ANNUAL SALARY. Employee's annual salary ("Annual Salary") commencing as
of March 1, 2000 shall be Two-Hundred, and Fifty Thousand, Dollars ($250,000),
payable in accordance with the Company's standard payment terms. The amount of
any Annual Salary increases in subsequent years shall be determined by the
Compensation Committee ("Committee") or the Board in its sole discretion.

     B. ANNUAL BONUS. Employee's annual bonus ("Annual Bonus") for 2000 shall
be seventy-five percent (75%) of the 2000 Annual Salary, payable in accordance
with Employee's satisfactory fulfillment of the objectives as established and
determined by the Committee or the Board. Any future Annual Bonus(es) in
subsequent years shall be determined by the Committee or the Board.

     C. BENEFITS. Employee shall be entitled to receive the same employee
benefits as made available by Company to its former Chief Executive Officers.

4.   STOCK OPTION. The Company acknowledges that Employee has received an
option to purchase Two Hundred Thousand (200,000) shares of common stock of the
Company (the "Option") on the terms and subject to the conditions set forth in
the Stock Option Agreement, attached hereto as EXHIBIT C.

5.   TERM. The term of this Agreement (the "Term") shall commence on the
Effective Date and shall remain in full force and effect for three (3) years
thereafter, unless sooner terminated as provided in Section 9 below. Upon the
Effective Date, the previously executed Employment Agreement between Company
and Employee dated January 10, 1995 shall be deemed to have terminated
automatically and shall thereafter be of no further force or effect, and this
Agreement shall supersede all prior agreements, arrangements and understandings
with respect to the subject matter hereof, except as set forth in Section
13(b).

6.   OWNERSHIP.

For purposes of this Agreement, "Work Product" shall mean the data, materials,
documentation, computer programs, inventions (whether or not patentable), and
all works of authorship, including all worldwide rights therein under patent,
copyright, trade secret, confidential information, or other property right,
created or developed in whole or in part by Employee, whether prior to or after
the Effective Date, while retained or employed by Company (whether developed
during work hours or not). All Work Product shall be considered work made for
hire by Employee and owned by Company. If any of the Work Product may not, by
operation of law or otherwise, be considered work made for hire by Employee for
Company, or if ownership of all right, title, and interest of the intellectual
property rights therein shall not otherwise vest exclusively in Company,
Employee hereby assigns to Company, and upon the future creation thereof
automatically assigns to Company, without further consideration, the ownership
of all Work Product. Company shall have the right to obtain and hold in its own
name copyrights, patents, registrations, and any other protection available in
the Work Product. Employee agrees to perform, during or after Employee's
employment, such further acts as may be necessary or desirable to transfer,
perfect, and defend Company's ownership of the Work Product that are reasonably
requested by Company.

7.   LICENSE. To the extent any materials other than Work Product are contained
in the materials Employee delivers to Company or Company's customers ("Licensed
Materials"), Employee grants to Company an irrevocable, nonexclusive,
worldwide, royalty-free license to: (i) use and distribute (internally or
externally) copies of, and prepare derivative works based upon, the Licensed
Materials and derivative works thereof, and (ii) authorize others to do any of
the foregoing.

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8.   NONDISCLOSURE OF PROPRIETARY INFORMATION.

     a. As used herein, "Trade Secrets" means information constituting a trade
secret within the meaning of Section 10-1-761(4) of the Georgia Trade Secrets
Act of 1990, including all amendments hereafter adopted. As used herein,
"Confidential Information" means information, other than Trade Secrets, that is
of value to its owner and is treated as confidential. "Proprietary Information"
means, collectively, Confidential Information and Trade Secrets.

     b. Company may disclose to Employee certain Proprietary Information.
Employee acknowledges and agrees that the Proprietary Information of Company is
the sole and exclusive property of Company (or a third party providing such
information to Company) and that Company owns all worldwide copyrights, trade
secret rights, confidential and proprietary information rights, and all other
property rights therein.

     c. Employee acknowledges and agrees that the disclosure of the Proprietary
Information of Company to Employee does not confer upon Employee any license,
interest or rights of any kind in or to the Proprietary Information.

     d. Employee agrees to use the Proprietary Information solely for the
benefit of Company. Except in the performance of services for Company, Employee
will hold in confidence and not use, reproduce, distribute, transmit, reverse
engineer, decompile, disassemble, or transfer, directly or indirectly, in any
form, by any means, or for any purpose, the Proprietary Information of Company
or any portion thereof communicated, discussed, delivered or made available by
Company to or received by Employee, whether orally or in written form, without
the prior written consent of Company. Employee shall notify Company immediately
upon discovery of any unauthorized use or disclosure of the Proprietary
Information.

     e. Employee acknowledges that its obligations under this Agreement with
regard to the Trade Secrets of Company remain in effect for as long as such
information shall remain a trade secret under applicable law. Employee
acknowledges that its obligations with regard to the Confidential Information
of Company shall remain in effect while Employee is retained by Company to
perform the Duties and for three (3) years thereafter. The foregoing
obligations shall not apply if and to the extent that: (a) Employee establishes
that the information communicated was already known to Employee, without
obligation to keep it confidential, at the time of its receipt from Company;
(b) Employee establishes that the information communicated was received by
Employee in good faith from a third party lawfully in possession thereof and
having no obligation to keep such information confidential; or (c) Employee
establishes that the information communicated was publicly known at the time of
its receipt by Employee or has become publicly known other than by a breach of
this Agreement or other action by Employee.

     f. The terms of this Agreement and the relationship between Company and
Employee shall be subject to the obligations of nondisclosure herein, except to
the extent that disclosure thereof is required by law or regulation.

9.   TERMINATION. The parties agree that Employee's term of employment may
be terminated at any time, for any reason or for no reason, with cause or
without cause (as defined below), by Company or Employee.

     A. TERMINATION WITH CAUSE. The parties agree that Employee's employment
may be terminated at any time with notice by Company for cause ("Termination
With Cause") under any one or more of the following events:

                  (i) Employee's  knowing  and  willful  misconduct  with
         respect to the business and affairs of the Company;

                  (ii)  Any material violation by Employee of any policy of the
         Company relating to ethical business conduct or practices or fiduciary
         duties of a senior executive;

                  (iii) Knowing and willful material breach of any provision of
         this Agreement which is not remedied within thirty (30) days after
         Employee's receipt of notice thereof;

                  (iv)  Employee's commission of a felony or an illegal act
         involving moral turpitude or fraud or Employee's dishonesty which may
         reasonably be expected to have a material adverse effect on the
         Company; and/or

                  (v) Failure to comply with reasonable directives of the Board
         which are consistent with the Duties, if not remedied within thirty
         (30) days after Employee's receipt of notice thereof.

     B. TERMINATION WITHOUT CAUSE. "Termination Without Cause" means any
termination of employment by the Company which is not "Termination With Cause"
as defined above. A resignation or voluntary departure from Company by Employee
or his death shall not be deemed Termination Without Cause under this
Agreement.

     C. SEVERANCE. In the event that Employee's employment is Terminated
Without Cause by Company at any time (other than at the expiration of the
Term), Company shall pay to Employee the severance pay equal to Employee's
Annual Salary at the then current rate for a period equal to the remainder of
the then current Term ("Severance Period"). The severance pay shall be payable
to Employee in accordance with the Company's standard pay periods and shall be
subject to all applicable withholdings, or, in the Company's sole discretion,
in a lump sum equal to the Annual Salary for the period equal to the remainder
of the current Term, discounted to its present value as reasonably determined
by the Board.

     D. POST TERMINATION OBLIGATIONS. Upon termination of employment for any
reason, Employee shall return immediately to Company all documents, property,
and other records of Company, and all copies thereof, and all Work Product
within Employee's possession, custody or control, including but not limited to
any materials containing any Trade Secrets or Confidential Information or any
portion thereof.

10.  CUSTOMER NON-SOLICITATION. The relationships made or enhanced in the
course of Employee's employment with the Company belong to Company. During
Employee's

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employment with Company and for the period of one (1) year after termination of
Employee's employment with Company for any reason or the Severance Period,
whichever is longer (the "Limitation Period"), Employee shall not contact,
solicit or attempt to solicit, on Employee's own behalf or on behalf of any
other person or entity, any customer or prospective customer of Company with
whom Employee had contact in the two (2) years prior to the end of Employee's
employment with Company ("Restrictive Period") with a view to offering,
providing, selling or licensing during the Limitation Period any program,
product or service that is competitive with the Company's business as defined
in EXHIBIT B ("Company Business").

11.  EMPLOYEE NON-SOLICITATION. During the Limitation Period, Employee
agrees not to call upon, solicit, recruit, or assist others in calling upon,
recruiting or soliciting any person who is or was an employee of Company during
the Restrictive Period, for the purpose of having such person work in any other
corporation, association, entity, or business that is competitive with the
Company Business.

12.  NONCOMPETITION. During the Limitation Period, Employee agrees that,
without the prior written consent of Company, Employee shall not perform the
duties specified on EXHIBIT A and performed by Employee during the Restrictive
Period for any person or entity competing with the Company Business in the
territory defined in EXHIBIT B ("Territory"), provided that Company is still
engaged in the Company Business. The parties agree and acknowledge that: (i)
the periods of restriction and Territory of restriction contained in this
Agreement are fair and reasonable in that they are reasonably required for the
protection of Company and that the Territory is the area in which Employee
shall perform (or currently performs) services for Company; and (ii) by having
access to information concerning employees and actual or prospective customers
of Company, Employee shall obtain a competitive advantage as to such parties.
If, however, for any reason any court determines that the restrictions in
Sections 10 through 12 are not reasonable or that consideration is inadequate,
then such restrictions shall be interpreted, modified or re-written to include
as much of the duration, scope and geographic area in this section as will
render such restrictions valid and enforceable.

13.  INDEMNIFICATION.

     A. BY EMPLOYEE. Employee shall indemnify and hold harmless Company, any
affiliated corporation, and their respective shareholders, directors, officers,
agents, and employees, from and against any and all liability, including
payment of attorneys' fees, arising directly or indirectly from a violation of
Section 13.

     B. BY COMPANY. Company shall indemnify and hold harmless Employee in
accordance with the indemnification obligations as set forth in Article IX,
Section 2 of the Company's Amended and Restated Bylaws dated April 29, 1995,
and the previously executed Indemnification Agreement between Company and
Employee.

14.  EQUITABLE RELIEF. The parties to this Agreement acknowledge that a
breach by Employee of any of the terms or conditions of this Agreement will
result in irrevocable harm to Company and that the remedies at law for such
breach may not adequately compensate Company for damages suffered. Accordingly,
Employee agrees that in the event of such breach, Company shall be entitled to
injunctive relief or such other equitable remedy as a court of competent
jurisdiction may provide. Nothing contained herein will be construed to limit
Company's right to any remedies at law, including the recovery of damages for
breach of this Agreement.

15.  SEVERABILITY. If any provision or part of any provision of this
Agreement is held invalid or unenforceable by a court of competent
jurisdiction, such holding shall not affect the enforceability of any other
provisions or parts thereof, and all other provisions and parts thereof shall
continue in full force and effect.

16.  ARBITRATION. Any controversy or claim arising out of or relating to
this Agreement or the breach thereof (other than disputes with respect to
alleged violations of the covenants contained in Sections 10, 11, and 12, and
the Company's pursuit of the remedies described in Section 15 in connection
therewith) shall be settled by arbitration in Atlanta, Georgia. In such case,
both parties agree to the appointment of three (3) arbitrators, with one
arbitrator selected by each party, and the third selected by the American
Arbitration Association ("AAA"). The arbitration shall be conducted in Atlanta,
Georgia in accordance with the Commercial Arbitration Rules, regulations and
procedures of the AAA. The judgment upon the award rendered may be entered in
any court having jurisdiction thereof. The parties shall be free to pursue any
remedy before the arbitration tribunal that they shall be otherwise permitted
to pursue in a court of competent jurisdiction, and the decision of the
arbitration panel shall be final and binding on both parties.

17.  MISCELLANEOUS. This Agreement shall not be amended or modified except
by a writing executed by both parties. This Agreement shall be binding upon and
inure to the benefit of Company and its successors and assigns. Due to the
personal nature of this Agreement, Employee shall not have the right to assign
Employee's rights or obligations under this Agreement without the prior written
consent of Company. This Agreement shall be governed by the laws of the State
of Georgia without regard to its rules governing conflicts of law. This
Agreement and the attached Exhibits represent the entire understanding of the
parties concerning the subject matter hereof and supersede and terminate all
prior communications, agreements and understandings, whether oral or written,
relating to the subject matter hereof. All communications required or otherwise
provided under this Agreement shall be in writing and shall be deemed given
when delivered to the address provided below such party's signature (as may be
amended by notice from time to time), by hand, by courier or express mail, or
by registered or certified United States mail, return receipt requested,
postage prepaid. The exhibits attached hereto are incorporated herein by this
reference.

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     IN WITNESS WHEREOF, the parties hereto have executed this Agreement and
affixed their hands and seals effective as of the date first above written.

<TABLE>
COMPANY:   HARBINGER CORPORATION                                          EMPLOYEE:   JAMES M. TRAVERS

<S>                                                                       <C>
By:  /s/ Loren B. Wimpfheimer
    ---------------------------------------------------                   Signature:  /s/ James M. Travers
                                                                                    -----------------------
Title:  Vice President
      -------------------------------------------------                   Date:  March 13, 2000
Date:  March 13, 2000
                                                                          Address:  1014 Kettering Place
                                                                                    Alpharetta, Georgia 30022
Address:  1277 Lenox Park Boulevard
          Atlanta, Georgia 30319
</TABLE>

<PAGE>   5

                                   EXHIBIT A

                                     DUTIES

     -   Develop Company's mission, strategic objectives and strategies year to
         year to achieve the Company's business goals as established by the
         Board of Directors.

     -   Serves as primary contact with company stockholders.

     -   Serves as primary contact with the investment community.

     -   Represents the Company in relations with major customers, suppliers,
         financial institutions, government

         agencies, etc.

     -   Manages the line operating units of the Company, either directly or
         through named subordinates.

     -   Establishes appropriate company policies and controls.

     -   Ensures soundness of the Company's financial structure, monitors
         operating results vs. approved plans and objectives.

     -   Establishes plans for the hiring, retention, and development of key
         personnel in the Company.

     -   Serves as a member of the Board of Directors.

     -   Assumes other projects and responsibilities as assigned by the Board of
         Directors.

<PAGE>   6

                                   EXHIBIT B

                                   TERRITORY

That territory in which the Employee performs services for the Company in North
America, Latin America, Europe, and Asia.

<PAGE>   7

                                   EXHIBIT C

                                    OPTIONS

     200,000 shares @ $26.87 on 2/18/00.

<PAGE>   8

                               FIRST AMENDMENT TO
                         EXECUTIVE EMPLOYMENT AGREEMENT

THIS FIRST AMENDMENT TO EXECUTIVE EMPLOYMENT AGREEMENT ("Amendment") is entered
into this 1st day of March, 2000, by and between HARBINGER CORPORATION
("Company"), a Georgia corporation, and JAMES M. TRAVERS ("Employee"), an
individual, and amends that certain Executive Employment Agreement
("Agreement") entered into the 1st day of March, 2000, by and between the
Company and Employee. Capitalized terms used herein without definition shall
have the meanings ascribed to such terms in the Agreement. For and in
consideration of the mutual covenants described below, the parties hereby agree
as follows:

18.  AMENDMENT.  TThe Agreement is hereby amended by adding the following as
Section 18 of the Agreement:

18.  ACCELERATION OF OPTIONS. Employee has been and in the future may be awarded
options to purchase shares of the Company's common stock ("Employee Stock
Options") pursuant to the terms of the Company's stock option plans previously,
now or hereafter in effect (collectively, the "Plans"). The following terms
shall be applicable to all Employee Stock Options. In the event of any conflict
between the following terms and an Employee Stock Option, the following terms
shall control. For purposes of this Section, "Continuous Service" means a
period of continuous performance of services by Employee for the Company, a
Parent or a Subsidiary, as determined by the Board or Committee.

        A. ONGOING VESTING. Notwithstanding anything herein or in any Employee
Stock Option to the contrary, if Employee is terminated by the Company as a
result of a Termination Without Cause, then for purposes of subsection (a) of
this Section 18 and the Employee Stock Options, the Employee Stock Options
shall continue to vest over time as if Employee was in Continuous Service
during such time.

        B. ACCELERATION. Notwithstanding this Section 18 or anything in an
Employee Stock Option to the contrary, the Employee Stock Options shall be
deemed accelerated, fully vested and fully exercisable in the event of a Change
in Control (defined below) as long as such acceleration and vesting does not
adversely impact the availability of pooling of interests accounting treatment,
as such determination is made by the Board in its reasonable discretion.

       C. CHANGE IN CONTROL. A "Change in Control" shall be conclusively deemed
to have occurred if (and only if) any of the following shall have taken place:
(i) a change in control is reported by the Company in response to either Item
6(e) of Schedule 14A of Regulation 14A promulgated under the Securities
Exchange Act of 1934, as amended ("Exchange Act"), or Item 1 of Form 8-K
promulgated under the Exchange Act; (ii) any person (as such term is used in
Section 13(d) and 14(d)(2) of the Exchange Act) is or becomes the beneficial
owner (as defined in Rule 13d-3 under the Exchange Act) directly or indirectly,
of securities of the Company representing forty percent (40%) or more of the
combined voting power of the Company's then outstanding securities; or (iii)
following the election or removal of directors, a majority of the Board
consists of individuals who were not members of the Board two years before such
election or removal, unless the election of each director who was not a
director at the beginning of such two-year period has been approved in advance
by directors representing at least a majority of the directors then in office
who were directors at the beginning of the two-year period.

<PAGE>   9

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment and
affixed their hands and seals effective as of the date first above written.

COMPANY:   HARBINGER CORPORATION            EMPLOYEE:   JAMES M. TRAVERS

By:  /s/ Loren B. Wimpfheimer
     ---------------------------           Signature:  /s/ James M. Travers
                                                       -----------------------
Title: Vice President
       ------------------------
                                            Date:  March 13, 2000
Date:  March 13, 2000

Address:  1277 Lenox Park Boulevard         Address:  1014 Kettering Place
          Atlanta, Georgia 30319                      Alpharetta, Georgia 30022

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