Document:

<PAGE>
                                                                   Exhibit 10.39

                               RETENTION AGREEMENT

      This Agreement is made this 3rd day of October 2002, by and between Ralph
Ungermann ("Executive") and First Virtual Communications, Inc. (the "Company").

      WHEREAS, Executive presently serves as the Executive Chairman of the Board
of Directors of the Company (the "Board");

      WHEREAS, the Company desires to retain the services of Executive over the
next eighteen months;

      NOW, THEREFORE, in consideration of the mutual promises contained herein,
the parties hereto agree as follows:

1.    PERIOD OF SERVICES

      Executive shall continue to render services to the Company with the duties
and responsibilities described in Section 2 below, from October 1, 2002 through
March 31, 2004 (the "Term").

2.    POSITION AND DUTIES

      Executive shall continue to render services as the Company's Executive
Chairman of the Board, with such duties commonly incident to the office, and as
the Company's principal high-level interface with its major customers located in
Japan and Asia and such other duties as the Board and Executive shall mutually
agree upon from time to time.

3.    COMPENSATION

      The Company shall pay Executive an annual base salary of Three Hundred
Fifty Thousand Dollars ($350,000.00), payable bi-monthly during the Term,
subject to customary withholding taxes and any other employment taxes as are
commonly required to be collected or withheld by the Company, in accordance with
the Company's standard payroll practices.

      Executive shall also be eligible for a Target Bonus of $150,000 during the
Term, as set forth in Exhibit A attached hereto.

4.    SEVERANCE

      In the event that Executive is removed from his position and duties set
forth in Section 2 above without Cause (as defined below), or Executive's
position and duties as set forth in Section 2 above are materially diminished by
the Board without Cause and without Executive's consent, the Company agrees to
make a single lump sum payment to Executive of all remaining base salary through
the end of the Term, and any earned Target Bonus compensation owed to Executive
by the Company as of the date of Executive's termination.

                                       1.
<PAGE>
5.    CAUSE

      For purposes of this Agreement, the Company shall have "Cause" to
immediately terminate Executive's employment hereunder if (i) Executive engages
in fraud or embezzlement, (ii) Executive misappropriates Company property,
proprietary information and/or trade secrets, (iii) Executive demonstrates
material unfitness for service or persistent deficiencies in performance, as
determined by the Board in its sole discretion, (iv) Executive engages in
misconduct, which misconduct is demonstrably and materially injurious to the
Company and/or its subsidiaries, (v) Executive breaches any provision of this
Agreement or other agreements between Executive and the Company, or (vi)
Executive dies or becomes mentally or physically incapacitated and cannot carry
out his duties.

6.    ARBITRATION

      The parties hereby agree that any dispute, claim or controversy arising
out of, relating to or in connection with this Agreement ("Arbitrable Claims")
shall be determined exclusively by and through final and binding arbitration in
Santa Clara County, California, each party hereto expressly and conclusively
waiving its right to proceed to a judicial determination with respect to the
merits of such arbitrable matters. Such arbitration shall be conducted in
accordance with the American Arbitration Association National Rules for
Resolution of Employment Disputes then in effect before a neutral and impartial
arbitrator who shall be selected by mutual agreement of the parties. The
arbitrator shall prepare a written decision containing the essential findings
and conclusions on which the award is based so as to ensure meaningful judicial
review of the decision. The arbitrator shall apply the same substantive law,
with the same statutes of limitations and same remedies, that would apply if the
claims were brought in a court of law. This Agreement shall be governed by the
California Arbitration Act and the arbitrator, in ruling on procedural and
substantive issues raised in the arbitration itself, shall apply the substantive
law of the State of California. Either party may bring an action in court to
compel arbitration under this Agreement and to enforce an arbitration award.
Otherwise, neither party shall initiate or prosecute any lawsuit in any way
related to any Arbitrable Claim. THE PARTIES HEREBY WAIVE ANY RIGHTS THEY MAY
HAVE TO TRIAL BY JURY IN REGARD TO ARBITRABLE CLAIMS.

7.    SEVERABILITY

      If one or more of the provisions of this Agreement are deemed
unenforceable by law, then such provision or provisions will be deemed stricken
from this Agreement and the remaining provisions shall continue in full force
and effect.

8.    GOVERNING LAW

      The interpretation, performance and enforcement of this Agreement shall be
governed by the laws of the State of California.

9.    ENTIRE AGREEMENT

      This Agreement is the final, complete and exclusive agreement of the
parties with respect to the subject matter hereof and supersedes and merges all
prior discussions between the

                                       2.
<PAGE>
Company and Executive. No modification of or amendment to this Agreement, nor
any waiver of any rights under this Agreement, will be effective unless in
writing and signed by the Company and Executive.

10.   ACKNOWLEDGMENT

      Executive acknowledges that in the event that he receives severance
benefits under Section 4 of this Agreement, then such amount will be offset
against any severance benefits to which Executive is entitled under Section 5(i)
of the Company's Executive Officers' Change of Control Plan adopted by the Board
on February 17, 1999, as such may be amended from time to time.

11.   DATE OF AGREEMENT

      The parties have duly executed this Agreement on the date first written
above.

                                            EXECUTIVE

                                            ____________________________________
                                                      Ralph Ungermann

                                            FIRST VIRTUAL COMMUNICATIONS, INC.

                                            By:_________________________________
                                            Title:______________________________

                                       3.
<PAGE>
                                    EXHIBIT A

                                  TARGET BONUS

      Executive shall be eligible to earn an aggregate Target Bonus of $150,000
upon achievement of all of the six minimum performance targets established by
the Independent Directors (as defined below) for each quarter during the Term,
payable in six $25,000 increments. For each quarterly Target Bonus period during
the Term, Executive will not be deemed to have earned a Target Bonus in a
quarterly period until and unless the minimum performance targets established by
the Independent Directors for that period have been met within the designated
timeframes, as determined by the Independent Directors in their sole discretion.
Executive shall not be eligible for any portion of Target Bonus that is not
earned within the designated quarterly timeframe.

      Minimum performance targets for Executive shall be established by the
independent directors of the Board (which shall include all directors of the
Company other than those also serving as employees of the Company), currently
consisting of Dr. Gaut and Messrs. Harris, Morgan and Stettner (the "Independent
Directors"), and agreed upon by Executive for each quarter during the Term,
commencing with the quarter October 1, 2002 through December 31, 2002. The
Independent Directors and Executive shall agree in writing upon the minimum
performance targets for each quarter during the Term as soon as possible at the
beginning of each such quarter during the Term.

      The $25,000 Target Bonus for each of the six Target Bonus periods during
the Term will accrue and be paid to Executive no later than 30 days after the
filing by the Company with the Securities and Exchange Commission of its Form
10-Q or Form 10-K covering the respective Target Bonus period.

                                       1.<PAGE>

                                                                   EXHIBIT 10.40

                        SETTLEMENT AND RELEASE AGREEMENT

October 29, 2002

Dear Killko:

This Settlement and Release Agreement (the "Agreement") sets forth the terms and
conditions of our agreement regarding the termination of your employment with
First Virtual Communications, Inc. (the "Company"). Pursuant to Section 14
herein, the Agreement shall become effective on the eighth day after this
Agreement is signed by you (the "Effective Date"). You and the Company hereby
agree as follows:

1.       SEPARATION DATE. Your employment as the Company's President and Chief
Executive Officer of the Company is terminated effective October 29, 2002 (the
"Separation Date"). You also agree to resign as a director of the Company and as
a director and officer of all subsidiaries of the Company for which you serve as
a director or officer, effective as of the Separation Date. You further agree to
execute any and all additional documents which may be required in connection
with such resignations.

2.       ACCRUED SALARY AND VACATION. You agree and acknowledge that the Company
has paid you all accrued salary, and all accrued and unused vacation benefits
earned through the Separation Date, if any, subject to standard payroll
deductions, withholding taxes and other obligations.

3.       EXPENSE REIMBURSEMENT. Within ten (10) business days of your execution
of this Agreement, you agree that you will submit your final documented expense
reimbursement statement reflecting all business expenses you incurred prior to
and including the Separation Date, if any, for which you seek reimbursement. The
Company shall reimburse your expenses pursuant to Company policy and regular
business practice.

4.       SEVERANCE. You acknowledge and agree that, following the Effective
Date, in accordance with the terms of Section 4.3.3 of the Employment and
Non-Competition Agreement between you and the Company effective as of June 19,
2001 (the "Employment Agreement") and as otherwise agreed by the Company as
consideration hereof, the Company will provide you with the following: (i) your
current annual base salary of $300,000, payable in bi-weekly installments over a
12-month period, subject to standard deductions and withholdings and subject to
the offset set forth in Section 5 below; (ii) the vesting and exercisability
schedules of each of the outstanding stock options granted to you by the Company
shall be accelerated by a period of one (1) year as of the Separation Date, such
that as of the Separation Date 359,375 of your outstanding options are vested
and exercisable (the "Vested Options"); (iii) bonus continuation payments in the
aggregate amount of $37,500, payable in equal bi-weekly monthly installments
over a 12-month period, subject to standard deductions and withholdings; and
(iv) to the extent provided by the federal COBRA law and by the Company's
current group health insurance policies, you will be eligible to continue your
health insurance. Later, you may be able

<PAGE>

to convert to an individual policy through the provider of the Company's health
insurance, if you wish. You will be provided with a separate notice of your
COBRA rights. In the event that you are eligible for, and elect, continued
coverage under COBRA, the Company, as part of this Agreement, will pay in full
for your COBRA coverage at the same level of coverage that you elected prior to
the Separation Date (if such coverage included your spouse and/or dependents
immediately prior to the Separation Date, your spouse and/or dependents will
also be covered), until the earlier of October 29, 2003 or the date you and your
spouse and/or dependents become covered under another employer's group health
plan that provides you and your spouse and/or dependents with comparable
benefits and levels of coverage (the earlier date being the "Termination Date").
Subsequent to the Termination Date, you will be solely responsible for full
payment of your COBRA insurance premiums. In addition, the post-termination
exercise period for your Vested Options is extended to January 31, 2003. In the
event that the Vested Options are not exercised by you on or prior to such date,
they will terminate. You understand and acknowledge that this extension of the
post-termination exercise period for your Vested Options may alter the status of
the Vested Options from incentive to non-qualified stock options. You understand
and agree that you assume full responsibility for and you agree to indemnify the
Company against any and all tax liability you may incur as a result of the
extended exercise period for your Vested Options.

5.       OFFSET; REPAYMENT OF PROMISSORY NOTE. In accordance with Section 4.3.4
of the Employment Agreement, the Company will reduce the $337,500 base salary
and bonus continuation payments payable pursuant to Sections 4(i) and 4(iii)
above by $150,000 effective as of March 20, 2003; or in the event of a change in
tax withholding requirements for Executive, such earlier or later date as the
remaining balance due to the Executive by the Company pursuant to Sections 4(i)
and 4(iii), as that the remaining balance due is required in order to repay the
Company the $150,000 due under the Amended and Restated Promissory Note,
referenced below, but in no event later than May 29, 2003; the $150,000
reduction on such date represents the payment in full by you to the Company of
the amount currently owed by you to the Company under that certain Amended and
Restated Promissory Note executed by you in favor of the Company on May 14, 2002
in the principal amount of $150,000 and the Company's agreement to defer the
offset per the terms above.

6.       STOCK OPTIONS. Except as provided in Section 4(ii) above, you
understand and agree that all vesting under any outstanding stock compensation
award you may hold from the Company shall cease on the Separation Date. Your
rights to exercise your outstanding stock options as to any vested shares
remains as set forth under the Company's equity incentive plans and your Stock
Option Agreements.

7.       OTHER COMPENSATION AND BENEFITS. Except as expressly provided herein,
you acknowledge and agree that you are not entitled to and will not receive any
additional compensation, severance, stock options, stock or benefits from the
Company.

8.       NONSOLICITATION/NONCOMPETITION. You acknowledge and agree that you
shall continue to be bound by your obligations specified in Section 2.2 of the
Employment Agreement.

9.       COMPANY PROPERTY. You agree to immediately return to the Company all
Company documents (and all copies thereof) and other Company property in your
possession or your

                                       2.

<PAGE>

control, including, but not limited to, Company files, business plans, notes,
samples, sales notebooks, drawings, specifications, calculations, sequences,
data, computer-recorded information, tangible property, including, but not
limited to, cellular phones, computers, credit cards, calling cards, entry
cards, keys and any other materials of any nature pertaining to your work with
the Company, and any documents or data of any description (or any reproduction
of any documents or data) containing or pertaining to any proprietary or
confidential material of the Company.

10.      PROPRIETARY INFORMATION OBLIGATIONS. You acknowledge your continuing
obligations under your Employee Proprietary Information and Inventions
Agreement, a copy of which is attached hereto as EXHIBIT A.

11.      NON-DISPARAGEMENT. You and the Company's officers and directors agree
not to disparage the other party, nor the other party's officers, directors,
employees, stockholders and agents, in any manner likely to be harmful to them
or their business, business reputation or personal reputation; provided that
both you and the Company may respond accurately and fully to any question,
inquiry or request for information when required by legal process.

12.      CONFIDENTIALITY AND PUBLICITY. The provisions of this Agreement shall
be held in strictest confidence by you and the Company and shall not be
publicized or disclosed in any manner whatsoever; provided, however, that: (a)
you may disclose this Agreement, in confidence, to your immediate family; (b)
the parties may disclose this Agreement in confidence to their respective
attorneys, accountants, auditors, tax preparers, and financial advisors; (c) the
Company may disclose this Agreement as necessary to fulfill standard or legally
required corporate reporting or disclosure requirements; and (d) the parties may
disclose this Agreement insofar as such disclosure may be necessary to enforce
its terms or as otherwise required by law.

13.      RELEASE OF CLAIMS. In exchange for the consideration provided to you by
this Agreement that you are not otherwise entitled to receive, you hereby
generally and completely release the Company and its directors, officers,
employees, stockholders, partners, agents, attorneys, predecessors, successors,
parent and subsidiary entities, insurers, affiliates, and assigns from any and
all claims, liabilities and obligations, both known and unknown, that arise out
of or are in any way related to events, acts, conduct, or omissions occurring
prior to your signing this Agreement. This general release includes, but is not
limited to: (1) all claims arising out of or in any way related to your
employment with the Company, including its predecessors, successors, parent and
subsidiary entities, or the termination of that employment; (2) all claims
related to your compensation or benefits from the Company, including salary,
bonuses, commissions, vacation pay, expense reimbursements, severance pay,
fringe benefits, stock, stock options, or any other ownership interests in the
Company; (3) all claims for breach of contract, wrongful termination, and breach
of the implied covenant of good faith and fair dealing; (4) all tort claims,
including claims for fraud, defamation, emotional distress, and discharge in
violation of public policy; and (5) all federal, state, and local statutory
claims, including claims for discrimination, harassment, retaliation, attorneys'
fees, or other claims arising under the federal Civil Rights Act of 1964 (as
amended), the federal Americans with Disabilities Act of 1990, the federal Age
Discrimination in Employment Act of 1967 (as amended) ("ADEA"), and the
California Fair Employment and Housing Act (as amended).

                                       3.

<PAGE>

14.      ADEA WAIVER. You further acknowledge that you are knowingly and
voluntarily waiving and releasing any rights you may have under the Age
Discrimination in Employment Act of 1967 ("ADEA"). You also acknowledge that the
consideration given for the waiver and release in the preceding paragraph hereof
is in addition to anything of value to which you were already entitled. If you
are forty (40) years of age or older when this release is signed, you hereby
provide the further acknowledgment that you are advised by this writing, as
required by the Older Workers Benefit Protection Act, that: (a) your waiver and
release do not apply to any rights or claims that may arise after the Effective
Date of this release; (b) you have the right to consult with an attorney prior
to executing this release (although you may voluntarily choose not to do so);
(c) you may have twenty-one (21) days to consider this Agreement (although you
may by your own choice execute this release earlier); (d) you have seven (7)
days following the execution of this release to revoke this release; and (e)
this Agreement shall not be effective until the date upon which the revocation
period has expired, therefore making the Effective Date the eighth day after
this release is signed by you.

15.      UNKNOWN CLAIMS WAIVER. In giving the release in Sections 13 and 14
above, which includes claims which may be unknown to me at present, I hereby
acknowledge that I have read and understand Section 1542 of the Civil Code of
the State of California which reads as follows:

         A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS WHICH THE CREDITOR DOES NOT
         KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE
         RELEASE, WHICH IF KNOWN BY HIM MUST HAVE MATERIALLY AFFECTED HIS
         SETTLEMENT WITH THE DEBTOR.

I hereby expressly waive and relinquish all rights and benefits under this
section and any law or legal principle of similar effect in any jurisdiction
with respect to claims released hereby. Notwithstanding the above, you do not
release any claims you may have (i) under this Agreement, (ii) for
indemnification pursuant to and in accordance with applicable statutes and the
applicable terms of the certificate of incorporation or bylaws of the Company,
and any insurance coverage or contractual rights for such claims, (iii) vested
pension or retirement benefits under the terms of qualified employee pension
benefit plans, if any, or (iv) for accrued benefits under the terms of
applicable employee benefit plans.

16.      NO ADMISSIONS. The parties hereto hereby acknowledge that this is a
compromise settlement of various matters, and that the promised payments in
consideration of this Agreement shall not be construed to be an admission of any
liability or obligation by either party to the other party or to any other
person whomsoever.

17.      ENTIRE AGREEMENT. This Agreement, including Exhibit A and Section 2.2
of the Employment Agreement, constitute the complete, final and exclusive
embodiment of the entire Agreement between you and the Company with regard to
the subject matter hereof. It is entered into without reliance on any promise or
representation, written or oral, other than those expressly contained herein. It
may not be modified except in a writing signed by you and a duly authorized
officer of the Company. Each party has carefully read this Agreement, has been
afforded the opportunity to be advised of its meaning and consequences by his or
its respective attorneys, and signed the same of his or its free will.

                                       4.

<PAGE>

18.      SUCCESSORS AND ASSIGNS. This Agreement shall bind the heirs, personal
representatives, successors, assigns, executors, and administrators of each
party, and inure to the benefit of each party, its agents, directors, officers,
employees, servants, heirs, successors and assigns.

19.      APPLICABLE LAW. This Agreement shall be deemed to have been entered
into and shall be construed and enforced in accordance with the laws of the
State of California as applied to contracts made and to be performed entirely
within California.

20.      ATTORNEYS' FEES. In the event of any litigation arising out of or
relating to this Agreement, its breach or enforcement, including an action for
declaratory relief, the prevailing party in such action or proceeding shall be
entitled to receive his or its damages, court costs, and all out-of-pocket
expenses, including attorneys fees. Such recovery shall include court costs,
out-of-pocket expenses, and attorneys fees on appeal, if any.

21.      SEVERABILITY. If a court of competent jurisdiction determines that any
term or provision of this Agreement is invalid or unenforceable, in whole or in
part, then the remaining terms and provisions hereof shall be unimpaired. Such
court will have the authority to modify or replace the invalid or unenforceable
term or provision with a valid and enforceable term or provision that most
accurately represents the parties' intention with respect to the invalid or
unenforceable term or provision.

22.      INDEMNIFICATION. Each party will indemnify and save harmless each other
party hereto from any loss incurred directly or indirectly by reason of the
falsity or inaccuracy of any representation made herein.

23.      AUTHORIZATION. Each party warrants and represents that there are no
liens or claims of lien or assignments in law or equity or otherwise of or
against any of the claims or causes of action released herein and, further, that
you are fully entitled and duly authorized to give your complete and final
general release and discharge.

24.      COUNTERPARTS. This Agreement may be executed in two counterparts, each
of which shall be deemed an original, all of which together shall constitute one
and the same instrument.

25.      SECTION HEADINGS. The section and paragraph headings contained in this
Agreement are for reference purposes only and shall not affect in any way the
meaning or interpretation of this Agreement.

                                       5.

<PAGE>

Please confirm your assent to the foregoing terms and conditions of this
Agreement by signing and returning a copy of this letter to me within twenty-one
(21) days of the date hereof.

Sincerely,

FIRST VIRTUAL COMMUNICATIONS, INC.

JONATHAN MORGAN
ACTING PRESIDENT AND CHIEF EXECUTIVE OFFICER

Attachments:
Exhibit A - Employee Proprietary Information and Inventions Agreement

HAVING READ AND REVIEWED THE FOREGOING, I HEREBY AGREE TO AND ACCEPT THE TERMS
AND CONDITIONS OF THIS AGREEMENT AS STATED ABOVE.

Dated: ________________                      _______________________________
                                                   KILLKO CABALLERO

                                       6.

<PAGE>

                                    EXHIBIT A

                      EMPLOYEE PROPRIETARY INFORMATION AND
                              INVENTIONS AGREEMENT

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00050-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00050-of-00352.parquet"}]]