Document:

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                                                           Exhibit 10.6

                              STANDSTILL AGREEMENT

                  STANDSTILL AGREEMENT, dated as of November 30, 1999,
between NBC Internet, Inc., formerly known as Xenon 2, Inc., a Delaware
corporation (together with its successors, the "COMPANY"), and CNET, Inc., a
Delaware corporation (together with its successors, "CNET").

                              W I T N E S S E T H :

                  WHEREAS, CNET, Xoom.com, Inc., a Delaware corporation
("XOOM"), the Company and Xenon 3, a Delaware corporation, have entered into
that certain Agreement and Plan of Contribution and Merger, dated as of May
9, 1999, as amended (the "MERGER AGREEMENT"), pursuant to which CNET will
become a holder of shares of the Class A common stock, $.0001 par value, of
the Company (the "COMMON STOCK"); capitalized terms not otherwise defined
herein shall bear the meaning given to them in the Merger Agreement;

                  WHEREAS, the Company and CNET desire, in connection with
CNET's investment in the Company pursuant to the Merger Agreement, to make
certain covenants and agreements with one another pursuant to this Agreement;
and

                  WHEREAS, it is a condition to the execution of the Merger
Agreement and the closing of the transactions contemplated thereby that the
parties enter into this Agreement.

                  NOW THEREFORE, in consideration of the mutual agreements
and understandings set forth herein, and for other good and valuable
consideration, the receipt and sufficiency of which is hereby acknowledged,
the parties hereto hereby agree as follows:

                                        ARTICLE I

                                   CERTAIN DEFINITIONS

                  Section 1.1 DEFINITIONS. As used in this Agreement, the
following terms shall have the meanings set forth below:

                  "AFFILIATE" shall mean, with respect to any Person, any other
         Person that directly or indirectly controls, is controlled by, or is
         under common control with, such Person. As used in this definition,
         "control" (including its correlative meanings, "controlled by" and
         "under common control with") shall mean the possession, directly or
         indirectly, of power to direct or cause the direction of

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         management or policies (whether through ownership of securities or
         partnership or other ownership interests, by contract or otherwise).

                  "AGREEMENT" shall mean this Agreement as in effect on the date
         hereof and as hereafter from time to time amended, modified or
         supplemented in accordance with the terms hereof.

                  "BENEFICIALLY OWN" shall have the meaning set forth in Rule
         13d-3 under the Exchange Act, except that a Person shall be deemed to
         "Beneficially Own" all securities that such Person has a right to
         acquire, whether such right is exercisable immediately or only after
         the passage of time.

                  "BOARD OF DIRECTORS" shall mean the Board of Directors of the
         Company as from time to time hereafter constituted.

                  "CNET" shall have the meaning set forth in the preamble hereto

                  "COMMON STOCK" shall mean the Class A common stock, par value
         $0.0001 per share, of the Company and any securities of the Company
         into which such Common Stock may be reclassified, exchanged or
         converted.

                  "COMPANY" shall have the meaning set forth in the preamble
         hereto.

                  "DISINTERESTED STOCKHOLDERS" shall mean any stockholder of the
         Company who is not a Restricted Party.

                  "EXCHANGE ACT" shall mean, as of any date, the Securities
         Exchange Act of 1934, as amended, or any similar federal statute then
         in effect and superseding such act, and any reference to a particular
         section thereof shall include a reference to the comparable section, if
         any, of such similar federal statute, and the rules and regulations
         thereunder.

                  "NBC" shall mean National Broadcasting Company, a Delaware
         corporation, together with its successors.

                  "NBC VOTING AGREEMENT" shall mean the Voting Agreement, dated
         as of the date hereof, between CNET and NBC, as the same may be
         amended, supplemented or otherwise modified form time to time.

                  "PERSON" shall mean an individual or a corporation,
         association, partnership, limited liability company, joint venture,
         organization, business, trust or any other entity or organization,
         including a government or any subdivision or agency thereof.

                  "REPRESENTATIVES" shall mean, with respect to any Person, such
         Person's directors, officers, employees, agents and other
         representatives acting in such capacity.

                                      -2-

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                  "RESTRICTED PARTIES" shall mean each of CNET and its
         Subsidiaries.

                  "SEC" shall mean the United States Securities and Exchange
         Commission.

                  "SECURITIES ACT" shall mean, as of any date, the Securities
         Act of 1933, as amended, or any similar federal statute then in effect
         and superseding such act, and any reference to a particular section
         thereof shall include a reference to the comparable section, if any, of
         any such similar federal statute, and the rules and regulations
         thereunder.

                  "STANDSTILL PERIOD" shall mean the period beginning on the
         date hereof and ending on the earlier of (i) the fifth anniversary of
         the date hereof and (ii) the first date after the date hereof on which
         the Restricted Parties do not Beneficially Own in the aggregate 5% or
         more of the outstanding Common Stock.

                  "SUBSIDIARY" shall mean, as to any Person, another Person of
         which outstanding securities having the power to elect a majority of
         the members of the board of directors (or comparable body or authority
         performing similar functions) of such other Person are at the time
         owned, directly or indirectly through one or more intermediaries, or
         both, by such first Person.

                  "THIRD PARTY TENDER OFFER" shall mean a bona fide public
         tender offer subject to the provisions of Regulation 14D under the
         Exchange Act, when first commenced within the meaning of Rule 14d-2 of
         the Exchange Act by a Person 13D Group (which is not made by and does
         not include any of the Company or any Affiliate or a Restricted Party
         or any 13D Group that includes the Company or an Affiliate or a
         Restricted Party) to purchase or exchange for cash or other
         consideration any Voting Stock and which consists of an offer to
         acquire 50% or more of the then outstanding Voting Stock of the
         Company.

                  "13D GROUP" means any "group" (within the meaning of Section
         13(d) of the Exchange Act) formed for the purpose of acquiring,
         holding, voting or disposing of Voting Stock.

                  "TRANSFER" shall have the meaning set forth in Section 2.2.

                  "VOTING STOCK" shall mean shares of the Common Stock and any
         other securities of the Company or its Subsidiaries having the ordinary
         power to vote in the election of members of the Board of Directors or
         the board of directors of any Subsidiary of the Company.

                                   ARTICLE II

                              STANDSTILL AGREEMENTS

                                      -3-

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                  Section 2.1  STANDSTILL AGREEMENT.

                  CNET covenants and agrees as follows:

                  (a) During the Standstill Period no Restricted Party will,
directly or indirectly, nor will it authorize or direct any of its
Representatives to (and will take appropriate action against such
Representatives to discourage), in each case unless specifically requested to
do so in writing in advance by the Board of Directors:

                  (i) acquire or agree, offer, seek or propose to acquire, or
         cause to be acquired, ownership of any assets or businesses of the
         Company or any of its Subsidiaries having a fair market value in excess
         of 5% of the fair market value of all of the Company's and its
         Subsidiaries' assets, or any rights or options to acquire any such
         ownership (including from a third party);

                  (ii) acquire or agree, offer, seek or propose to acquire, or
         cause to be acquired, Beneficial Ownership of any Voting Stock of the
         Company or any of its Subsidiaries, or any options, warrants or other
         rights (including, without limitation, any convertible or exchangeable
         securities) to acquire any such Voting Stock, in any case other than
         the Common Stock Beneficially Owned by the Restricted Parties on the
         date hereof.

                  (iii) make, or in any way participate in, any "solicitation"
         of "proxies" (as such terms are used in the proxy rules of the SEC)
         with respect to the voting of any securities of the Company or any of
         its Subsidiaries, except pursuant to the NBC Voting Agreement;

                  (iv) deposit any securities of the Company or any of its
         Subsidiaries in a voting trust or subject any such securities to any
         arrangement or agreement with any Person (other than one or more
         Restricted Parties and/or NBC and/or any Affiliate of NBC);

                  (v) form, join, or in any way become a member of a 13D Group
         with respect to any voting securities of the Company or any of its
         Subsidiaries (other than a "group" consisting solely of Restricted
         Parties and/or NBC and/or any Affiliate of NBC);

                  (vi) arrange any financing for, or provide any financing
         commitment for, the purchase of any voting securities or securities
         convertible or exchangeable into or exercisable for any voting
         securities or assets of the Company or any of its Subsidiaries, except
         for such assets as are then being offered for sale by the Company or
         such Subsidiary;

                  (vii) except pursuant to the NBC Voting Agreement, otherwise
         act, whether alone or in concert with others, to seek to propose to the
         Company any tender or exchange offer, merger, business combination,
         restructuring, liquidation, recapitalization

                                      -4-

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         or similar transaction involving the Company or any of its
         Subsidiaries, or nominate any person as a director of the Company,
         or propose any matter to be voted upon by the stockholders of the
         Company; PROVIDED that the provisions of this clause (vii) will not
         prohibit or restrict any Restricted Party from entering into any
         agreement, arrangement or understanding relating to the Transfer of
         any securities in accordance with Section 2.2 or engaging in any
         discussion or negotiations relating to any potential Transfer of any
         securities in accordance with Section 2.2;
                  (viii) nominate any person for election as director of the
         Company; or

                  (viii) publicly announce or disclose any intention, plan or
         arrangement inconsistent with the foregoing.

                  (b) In addition, during the Standstill Period no Restricted
Party will, nor will they authorize or direct any of their respective
Representatives to, take any action that would require the Company to make a
public announcement regarding any of the matters set forth in Section 2.1(a).

                  Section 2.2 TRANSFER RESTRICTIONS.

                  CNET covenants and agrees as follows:

                  (a) During the Standstill Period, the Restricted Parties
shall not, directly or indirectly, sell, transfer or otherwise dispose of
(collectively, "TRANSFER") any shares of Common Stock Beneficially Owned by
such Persons, except for Transfers: (i) to Restricted Parties or to
Affiliates who agree to be Restricted Parties bound by the provisions of this
Agreement, (ii) which have been consented to by the Company, (iii) pursuant
to a Third Party Tender Offer, (iv) pursuant to a merger, consolidation or
reorganization to which the Company is a party, (v) in a BONA FIDE public
distribution, bona fide underwritten public offering or open market sales
through a resale or otherwise, (vi) pursuant to Rule 144 of the Securities
Act, (vii) in a private sale or pursuant to Rule 144A of the Securities Act
or (viii) to NBC or any Affiliate of NBC. Notwithstanding anything herein to
the contrary, nothing herein shall prohibit or restrict the Restricted
Parties in any way from (i) pledging or hypothecating any shares of Common
Stock Beneficially Owned by the Restricted Parties to a financial institution
in a bona fide financing transaction so long as the Restricted Parties
control the voting of such Common Stock prior to the occurrence of a default
or (ii) entering into hedging strategies or transactions such as, for
example, the purchase and sale of puts, calls, options, straddles and other
hedging mechanisms with respect to such shares so long as the aggregate
hedging transactions of any time outstanding with any Person and its
Affiliates do not relate to an aggregate number of shares of Common Stock and
Class B Common Stock of the Company in excess of 5% of the outstanding shares
of Common Stock at the time such transactions were entered into (or an
equivalent position).

                  (b) Subject to the provisions of Section 2.2(a), if any
Restricted Party decides to dispose of any of the Common Stock, each
Restricted Party understands and agrees that it may do so only pursuant to an
effective registration statement under the Securities Act or pursuant to an
exemption from registration under the Securities Act. Each Restricted Party
agrees to the

                                     -5-

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imprinting, so long as appropriate, of substantially the following legends on
certificates representing any of the securities referenced in the preceding
sentence:

         THE SHARES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR THE SECURITIES LAWS OF
         ANY STATE AND MAY NOT BE SOLD, TRANSFERRED OR OTHERWISE DISPOSED OF
         UNLESS THEY ARE SO REGISTERED OR UNLESS AN EXEMPTION FROM REGISTRATION
         IS AVAILABLE AND THE COMPANY IS FURNISHED WITH AN OPINION OF COUNSEL
         REASONABLY SATISFACTORY TO THE COMPANY TO THAT EFFECT. IN ADDITION,
         SUCH SHARES MAY ONLY BE TRANSFERRED PURSUANT TO THE PROVISIONS OF THE
         STANDSTILL AGREEMENT, DATED AS OF ______ ___, 1999, BETWEEN THE COMPANY
         AND CNET, INC. AS THE SAME MAY BE AMENDED FROM TIME TO TIME, COPIES OF
         WHICH ARE ON FILE AT THE PRINCIPAL OFFICE OF THE COMPANY.

                  The legend set forth above shall be removed if and when (i)
the securities represented by such certificate are disposed of pursuant to an
effective registration statement under the Securities Act or (ii) CNET
delivers to the Company an opinion of counsel reasonably acceptable to the
Company to the effect that such legends are no longer necessary.

                                  ARTICLE III

                                 MISCELLANEOUS

                  Section 3.1 NOTICES. All notices and other communications
hereunder shall be in writing and shall be deemed to have been duly given, if
delivered personally, by telecopier or sent by overnight courier as follows:

                  (a)     If to CNET, to:

                          CNET, Inc.
                          150 Chestnut Street
                          San Francisco, California  94111
                          Attn: Douglas N. Woodrum
                          Facsimile:  (415) 395-9205

                          with copies to:

                          Hughes & Luce, L.L.P.
                          1717 Main Street, Suite 2800
                          Dallas, Texas  75201
                          Attn: R. Clayton Mulford

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                          Facsimile: (214) 939-5849 CNET, Inc.

                   (b)    If to the Company, to:
                          NBC Internet, Inc.
                          300 Montgomery Street
                          Suite 300
                          San Francisco, California 94104
                          Attn.:  General Counsel
                          Facsimile:  (415) 288-2580

                   with copies to:

                          Morrison & Foerster LLP
                          425 Market Street
                          San Francisco, California 94105
                          Attn.:  Bruce Alan Mann
                          Facsimile:  (415) 268-7522

                          Morrison & Foerster LLP
                          1290 Avenue of the Americas
                          New York, New York  10104
                          Attn.: Allen L. Weingarten
                          Facsimile: (212) 468-7900

or to such other address or addresses as shall be designated in writing. All
notices shall be effective when received.

                  Section 3.2 ENTIRE AGREEMENT; AMENDMENT. This Agreement
sets forth the entire agreement between the parties hereto with respect to
the transactions contemplated by this Agreement. Any provision of this
Agreement may be amended or modified in whole or in part at any time by an
agreement in writing between the parties hereto executed in the same manner
as this Agreement. No failure on the part of any party to exercise, and no
delay in exercising, any right shall operate as a waiver thereof nor shall
any single or partial exercise by any party of any right preclude any other
or future exercise thereof or the exercise of any other right.

                  Section 3.3 SEVERABILITY. In the event that any one or more
of the provisions contained in this Agreement or in any other instrument
referred to herein, shall, for any reason, be held to be invalid, illegal or
unenforceable in any respect, such invalidity, illegality or unenforceability
shall not affect any other provision of this Agreement or any other such
instrument.

                                      -7-

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                  Section 3.4 COUNTERPARTS. This Agreement may be executed in
one or more counterparts, each of which shall be deemed to constitute an
original, but all of which together shall constitute one and the same
document.

                  Section 3.5 GOVERNING LAW; JURISDICTION; WAIVER OF JURY
TRIAL . This Agreement shall be governed and construed in accordance with the
laws of the State of Delaware applicable to contracts executed and performed
within such state.

                  Section 3.6 SUCCESSORS AND ASSIGNS; THIRD PARTY
BENEFICIARIES. Neither party to this Agreement may assign any of its rights
or delegate any of its duties under this Agreement to any other Person
without the prior written consent of the other party to this Agreement. Any
purported assignment in violation of this Section shall be void. Nothing
expressed or mentioned in this Agreement is intended or shall be construed to
give any Person other than CNET and the Company and their respective
successors, any legal or equitable right, remedy or claim under or in respect
of this Agreement or any provision herein contained. This Agreement and all
conditions and provisions hereof are intended to be for the sole and
exclusive benefit of CNET and the Company and their respective successors,
and for the benefit of no other Person.

                  Section 3.7 SPECIFIC PERFORMANCE. The parties hereto agree
that irreparable damage would occur in the event any provision of this
Agreement was not performed in accordance with the terms hereof and that the
parties shall be entitled to an injunction or injunctions to prevent breaches
of this Agreement and to enforce specifically the terms and provisions of
this Agreement in addition to any other remedy to which they are entitled at
law or in equity.

                  Section 3.8 HEADINGS, CAPTIONS AND TABLE OF CONTENTS. The
section headings, captions and table of contents contained in this Agreement
are for reference purposes only, are not part of this Agreement and shall not
affect the meaning or interpretation of this Agreement.

                                      -8-

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         IN WITNESS WHEREOF, this Agreement has been executed by the parties
hereto or by their respective duly authorized representatives, all as of the
date first above written.

                                        NBC INTERNET, INC.

                                        By:  /s/ John Harbottle
                                           -----------------------------------
                                          Name:   John Harbottle
                                          Title:  EVP Finance and CFO

                                        CNET, INC.

                                        By:  /s/ Douglas N. Woodrum
                                           -----------------------------------
                                          Name:   Douglas N. Woodrum
                                          Title:  CFO<PAGE>

                                                                  Exhibit 10.10

                      VOTING AND RIGHT OF FIRST OFFER AGREEMENT

          VOTING AND RIGHT OF FIRST OFFER AGREEMENT, dated as of November 30,
1999 (the "AGREEMENT"), between National Broadcasting Company, a Delaware
corporation ("NBC"), and CNET, Inc., a Delaware corporation (together with
its successors and permitted assigns, "CNET").

          WHEREAS, CNET, Xoom.com, Inc., a Delaware corporation ("XOOM"),
Xenon 2, Inc., a Delaware corporation ("XENON 2"), and  Xenon 3, Inc., a
Delaware corporation, have entered into an Agreement and Plan of
Contribution, Investment and Merger, dated as of May 9, 1999, as amended (the
"XENON 2 MERGER AGREEMENT", capitalized terms not otherwise defined herein
shall have the meaning given to them in the Xenon 2 Merger Agreement; and
pursuant to which CNET will become a holder of shares of the Class A common
stock, $.0001 par value, of Xenon 2 (the "COMPANY COMMON STOCK");

          WHEREAS, NBC, Neon Media Corporation, a Delaware corporation
("NMC"), Xenon 2 and Xoom have entered into an Agreement and Plan of
Contribution, Investment and Merger, dated as of May 9, 1999, as amended (the
"NMC MERGER AGREEMENT"),  pursuant to which NMC will merge with and into
Xenon 2; and

          WHEREAS, it is a condition to the closing of the transactions
contemplated by the Xenon 2 Merger Agreement and the NMC Merger Agreement
that NBC and CNET enter into this Agreement.

          NOW, THEREFORE, in consideration of the premises and the mutual
promises contained herein and intending to be legally bound hereby, the
parties agree as follows:

                                      AGREEMENT

          1. REPRESENTATIONS AND WARRANTIES OF CNET.  CNET represents and
warrants to NBC  as follows:

          (a)   OWNERSHIP OF SECURITIES.  Upon consummation of the
transactions contemplated by the Xenon 2 Merger Agreement and the NMC Merger
Agreement at the Effective Time, CNET will be the record and beneficial owner
of, and have good and marketable title to, the number of shares of Company
Common Stock (the "CLOSING DATE SECURITIES") (together with any shares of
Company Common Stock hereafter acquired by CNET (including through the
exercise of options or similar instruments), the "SUBJECT SECURITIES") set
forth on the signature page to this Agreement.  CNET does not own of record
or beneficially any shares of capital stock of the Company on the date hereof
other than the Closing Date Securities. CNET has sole voting power and sole
power to issue instructions with respect to the voting of the Closing Date
Securities and sole power of disposition of the Closing Date Securities..

          (b)   POWER; BINDING AGREEMENT.  CNET has full power and authority to
enter into and perform all of its obligations under this Agreement.  This
Agreement has been duly and validly executed and delivered by CNET and
constitutes a valid and binding agreement of

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                                                                            2

CNET, enforceable against CNET in accordance with its terms, except as such
enforceability may be limited by bankruptcy, insolvency, reorganization,
moratorium and similar laws relating to or affecting creditors generally, by
general equity principles (regardless of whether such enforceability is
considered in a proceeding in equity or at law) or by an implied covenant of
good faith and fair dealing.

          (c)   NO CONFLICTS.  No filing with, and no permit, authorization,
consent or approval of, any state or federal governmental body or authority
or any other person or entity is necessary for the execution of this
Agreement by CNET and the consummation by CNET of the transactions
contemplated hereby, other than pursuant to the HSR Act or any filing,
permit, authorization, consent or approval, the failure of which to obtain
would not reasonably be expected to prevent CNET from performing its
obligations under this Agreement, and neither the execution and delivery of
this Agreement by CNET nor the consummation by CNET of the transactions
contemplated hereby nor compliance by CNET with any of the provisions hereof
will conflict with or result in any breach of any applicable organizational
documents or instruments applicable to CNET, result in a violation or breach
of, or constitute (with or without notice or lapse of time or both) a default
(or give rise to any third-party right of termination, cancellation, material
modification or acceleration) under any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, license, contract,
commitment, arrangement, understanding, agreement or other instrument or
obligation of any kind to which CNET is a party or by which the Subject
Securities may be bound or violate any order, writ, injunction, decree,
judgment, statute, rule or regulation applicable to CNET as of the date
hereof, other than such violations, breaches or defaults that would not
reasonably be expected to prevent CNET from performing its obligations under
this Agreement.

          2.  AGREEMENT TO VOTE SHARES.  At every meeting of the stockholders
of the Company called with respect to any Takeover Proposal, Material
Transaction Proposal or transaction or occurrence which if publicly proposed
and offered to the Company and its stockholders (or any of them) would be the
subject of a Takeover Proposal or Material Transaction Proposal
(collectively, a "SUBJECT PROPOSAL"), and at every adjournment of any such
meeting, and on every action or approval by written consent of the
stockholders of the Company with respect to any Subject Proposal, CNET
irrevocably agrees that it shall vote (or cause to be voted) all the Subject
Securities that it beneficially owns on the record date of any such vote or
action to ratify, approve and adopt any and all actions adopted or approved
by NBC, and against any and all actions voted against by NBC.  CNET shall not
commit or agree to take any action inconsistent with the foregoing.  As used
herein, "MATERIAL TRANSACTION PROPOSAL" means any inquiry, proposal or offer
from any Person relating to (i) the direct or indirect acquisition or
purchase of 5% or more of the assets (based on the fair market value thereof)
of Xenon 2 and its Subsidiaries, taken as a whole, or of 5% or more of any
class of equity securities of Xenon 2 or any of its Subsidiaries or any
tender offer or exchange offer (including by Xenon 2 or its Subsidiaries)
that if consummated would result in any person beneficially owning 5% or more
of any class of equity securities of Xenon 2 or any of its Subsidiaries, or
(ii) any merger, consolidation, business combination, sale of all or
substantially all assets, recapitalization, liquidation, dissolution or
similar transaction involving Xenon 2 or any of its Subsidiaries.  As used
herein, "TAKEOVER PROPOSAL" means any inquiry, proposal or offer from any
Person relating to (A) any of the matters set forth in clause (i) of the
definition of Material Transaction Proposal

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                                                                            3

but replacing "5%" with "50%" each place "5%" is used in such definition, (B)
a sale of all or substantially all of the assets of Xenon 2 and its
Subsidiaries or (C) a merger or consolidation of Xenon 2 as a result of which
the stockholders of Xenon 2 immediately prior to such transaction would not
beneficially own immediately after such transaction 50% or more of the
resulting or surviving entity (or the parent thereof)

          3.  IRREVOCABLE PROXY.  CNET hereby grants to, and appoints NBC and
the President and Treasurer of NBC and the Secretary of NBC, in their
respective capacities as officers of NBC, and any individual who shall
hereafter succeed to any such office of NBC, and any other designee of NBC,
each of them individually, CNET's proxy and attorney-in-fact (with full power
of substitution) to vote or act by written consent with respect to the
Subject Securities in accordance with Section 2 hereof.  This proxy is
coupled with an interest and shall be irrevocable, and CNET will take such
further action or execute such other instruments as may be necessary to
effectuate the intent of this proxy and hereby revokes any proxy previously
granted by it with respect to the Subject Securities; provided that this
proxy shall be automatically revoked without any further action on the part
of NBC and CNET upon the termination of this Agreement pursuant to Section 14
hereof.

          4.  REPRESENTATIONS AND WARRANTIES OF NBC.  NBC represents and
warrants, to CNET as follows:

          (a)   POWER; BINDING AGREEMENT.  NBC has full power and authority
to enter into and perform all of its obligations under this Agreement.  This
Agreement has been duly and validly executed and delivered by NBC and
constitutes a valid and binding agreement of NBC, enforceable against NBC in
accordance with its terms, except as such enforceability may be limited by
bankruptcy, insolvency, reorganization, moratorium and similar laws relating
to or affecting creditors generally, by general equity principles (regardless
of whether such enforceability is considered in a proceeding in equity or at
law) or by an implied covenant of good faith and fair dealing.

          (b)   NO CONFLICTS.  No filing with, and no permit, authorization,
consent or approval of, any state or federal governmental body or authority or
any other person or entity is necessary for the execution of this Agreement by
NBC and the consummation by NBC of the transactions contemplated hereby, other
than pursuant to the HSR Act or any filing, permit, authorization, consent or
approval, the failure of which to obtain would not reasonably be expected to
prevent NBC from performing its obligations under this Agreement, and neither
the execution and delivery of this Agreement by NBC nor the consummation by NBC
of the transactions contemplated hereby nor compliance by NBC with any of the
provisions hereof will conflict with or result in any breach of any
organizational documents or instruments applicable to NBC, result in a violation
or breach of, or constitute (with or without notice or lapse of time or both) a
default (or give rise to any third-party right of termination, cancellation,
material modification or acceleration) under any of the terms, conditions or
provisions of any note, bond, mortgage, indenture, license, contract,
commitment, arrangement, understanding, agreement or other instrument or
obligation of any kind to which NBC is a party or by which NBC's respective
properties or assets may be bound or violate any order, writ, injunction,
decree, judgment, statute, rule or regulation applicable to NBC as of the date
hereof, other than such

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                                                                            4

violations, breaches or defaults that would not reasonably be expected to
prevent NBC from performing its respective obligations under this Agreement.
 .

          5.  COVENANTS OF CNET.  CNET hereby agrees and covenants that:

          (a)   NO SOLICITATION.  CNET shall not, and shall not authorize its
affiliates, partners, investment bankers, attorneys, agents or other advisors
or representatives to, directly or indirectly, solicit, knowingly encourage
(including by way of providing confidential information or data) or have any
discussion or negotiate with any person or entity (other than NBC or any
affiliate of NBC) concerning any proposal by such person or entity with
respect to the Company that constitutes or could reasonably be expected to
lead to a Subject Proposal.  CNET will immediately cease and cause to be
terminated any existing activities, discussions or negotiations with any
parties conducted heretofore by or on its behalf with respect to any of the
foregoing.

          (b)   RESTRICTION ON TRANSFER, PROXIES AND NONINTERFERENCE.  CNET
shall not, and shall not authorize any of its affiliates, partners,
investment bankers, attorneys, agents or other advisors or representatives
to, directly or indirectly: (i) offer for sale, sell, transfer, tender,
pledge, encumber, assign or otherwise dispose of (including by gift), or
enter into any contract, option or other arrangement or understanding with
respect to or consent to the offer for sale, sale, transfer, tender, pledge,
encumbrance, assignment or other disposition of, any or all of the Subject
Securities (or any interest therein), other than in accordance with the
provisions of this Agreement and the Standstill Agreement, dated as of the
date hereof, between CNET and Xenon 2; (ii) except as contemplated hereby,
grant any proxies or powers of attorney, deposit any such Subject Securities
into a voting trust or enter into a voting agreement with respect to any of
the Subject Securities; (iii) take any action that would  have the effect of
preventing or disabling CNET from performing its obligations under this
Agreement; or (iv) commit or agree to take any of the foregoing actions.
CNET will not sell, transfer or otherwise dispose of any of the Subject
Securities to any affiliate of CNET unless such agrees to be bound by the
terms of this Agreement with respect to such Subject Securities as if it were
CNET and delivers a written agreement to NBC to such effect.

          (c)   FURTHER ASSURANCES.  CNET will, from time to time, execute
and deliver, or cause to be executed and delivered, without further
consideration, such additional or further consents, documents and other
instruments and take all such further actions as NBC may reasonably request
for the purpose of effectuating the matters covered by this Agreement in the
most expeditious manner practicable.

          6.  RIGHTS OF FIRST OFFER AND REOFFER.

          (a)   If CNET at any time intends to transfer, sell, assign,
exchange, mortgage, pledge, hypothecate or otherwise dispose of any Company
Common Stock or any interest therein (other than pursuant to a merger,
consolidation or reorganization to which the Company is a party or a tender
offer approved by the Board of Directors of the Company)  ("TRANSFER") to any
Person other than NBC and its affiliates (a "THIRD PARTY"), CNET shall first
give written notice (a "SELLER'S NOTICE") to NBC, stating CNET's intention to
make such Transfer, the name of the proposed Third Party transferee (if the
Transfer is to occur in a privately negotiated transaction),

<PAGE>
                                                                            5

the number of shares of Company Common Stock to be transferred (the "OFFERED
SHARES"), the price or other consideration per share which CNET proposes to
be paid for the Offered Shares by the Third Party (the "FIRST OFFER PRICE")
and the other material terms upon which such Transfer is proposed. It being
expressly understood that, with respect to proposed open market sales and
sales pursuant to bona fide underwritten public offerings, CNET may indicate
as the price in the Seller's Notice as the "then current market price" and
such indication shall be sufficient for such notice. If the Seller's notice
specifies the "then current market price" or that the sale will be made for
non-cash consideration, then the First Offer Price will be the closing price
for shares of Company Common Stock on the NASDAQ Stock Market on the day
immediately preceding NBC's acceptance of CNET's offer. CNET will not include
in any Seller's Notice more shares of Company Common Stock than the number of
shares it anticipates it will sell during the next 60 days.

          (b)         Upon receipt of the Seller's Notice (the "FIRST
OFFER"), NBC shall have an irrevocable, non-transferable (other than to
Affiliates) option to purchase all or any number of the Offered Shares at the
First Offer Price.  The option of NBC under this Section 6(b) shall be
exercisable by written notice to CNET given within 7 days from receipt of the
Seller's Notice. NBC may assign its rights under this Section 6 in whole or
in part to the Company.

          (c)         If NBC determines not to exercise its option to
purchase the Offered Shares at the First Offer Price or determines to
exercise its option to purchase less than all the Offered Shares, then CNET
shall be free, for a period of 60 days from the earlier of (i) the expiration
of the option period with respect to such First Offer pursuant to Section
6(b) and (ii) the date CNET shall have received written notice from NBC
stating that NBC intends not to exercise the option granted to it under the
foregoing provisions of this Section 6 with respect to all the Offered
Shares, to sell the Offered Shares as to which such options are not exercised
to the Third Party transferee at a price equal to or greater than the First
Offer Price and on substantially similar material terms as were contained in
the First Offer, PROVIDED that the Transfer complies with the provisions of
Section 5(b).

          (d)         In the event the proposed purchase price of a Third Party
transferee for the Offered Shares is less than the First Offer Price (other than
a reduction in the purchase price due to decreases in the market value of the
Company Common Stock if the Offered Shares are proposed to be sold in the open
market or pursuant to an underwritten offering) or is otherwise on terms that
are different in any material respect from those set forth in the Seller's
Notice, CNET shall not sell or otherwise transfer any of the Offered Shares
unless CNET shall first reoffer the Offered Shares at such lesser price to NBC
(the "REOFFER") by giving written notice (the "REOFFER NOTICE") to NBC, stating
the items required to be included in the Seller's Notice, including CNET's
intention to make such transfer at such lower price or on such different terms
(the "REOFFER PRICE").  NBC shall then have an irrevocable, non-transferable
(other than to Affiliates) option to purchase all or part of the Offered Shares
at the Reoffer Price, exercisable in the same manner as provided in Section
6(b).  In the event that NBC does not then elect to purchase all the remaining
Offered Shares, or NBC elects to purchase less than all the remaining Offered
Shares, the Offered Shares not so purchased may be sold by CNET within 60 days
following the earlier of (i) the expiration of the option period with respect to
the Reoffer pursuant to Section 6(b) or (ii) the date on which CNET shall have
received written notice from NBC

<PAGE>
                                                                            6

stating that NBC intends not to exercise the option granted to it in this
Section 6(d) with respect to all of the remaining Offered Shares, at a price
equal to or greater than the Reoffer Price, PROVIDED that the Transfer
complies with the provisions of Section 5(b).

          (e)         In the event that NBC does not exercise its option to
purchase any or all of the Offered Shares at the First Offer Price or at the
Reoffer Price, and CNET shall not have sold the remaining Offered Shares to a
Third Party transferee for any reason before the expiration of the 30-day
period described in Section 6(d) in the event of a Reoffer, or, if no Reoffer
Notice is given, the 60-day period described in Section 6(c), then all of the
provisions of this Section 6 shall again become applicable to any sales or
transfers of Company Common Stock by CNET.

          (f)   If NBC exercises its rights of first offer or reoffer
hereunder, the closing of the purchase of the Offered Shares with respect to
which such right has been exercised shall take place on the tenth day after
the later of (i) the date NBC gives notice of such exercise  and (ii) the
expiration of such time as NBC may reasonably require in order to comply with
applicable United States federal and state laws and regulations, which in no
event shall be more than 30 days after the date specified in clause (i).
Upon exercise by NBC of its rights of first offer and reoffer under this
Section 6,  NBC and CNET shall be legally obligated to consummate the
purchase contemplated thereby and shall use their best efforts to secure any
approvals required, and to comply as soon as practicable with all applicable
United States federal and state laws and regulations in connection
therewith.

          (g)   Notwithstanding anything herein to the contrary, (i) nothing
herein shall prohibit or restrict CNET in any way from (A) pledging or
hypothecating any Subject Securities to a financial institution in a bona
fide financing transaction so long as CNET controls the voting of such
Subject Securities prior to the occurrence of a default or (B) entering into
hedging strategies or transactions such as, for example, the purchase and
sale of puts, calls, options, straddles and other hedging mechanisms with
respect to Subject Securities so long as the aggregate hedging transaction at
any time outstanding with any Person and its affiliates do not relate to an
aggregate number of shares of Common Stock in excess of 5% of the outstanding
shares of Common Stock and Class B Common Stock of the Company at the time
such transactions were entered into (or an equivalent position) and (ii) the
transactions described in clause (i) shall not be a Transfer and shall not be
subject to the Right of First Offer set forth in this Section 6.

          7.  ENTIRE AGREEMENT; ASSIGNMENT; BENEFITS.  This Agreement
constitutes the entire agreement between the parties with respect to the
subject matter hereof and supercedes all other prior agreements and
understandings, both written and oral, between the parties with respect to
the subject matter hereof. Except as provided in the last sentence of Section
5(b), this Agreement may not be assigned by any party hereto without the
prior written consent of the other party.  This Agreement shall be binding
upon, and shall inure to the benefit of, each of NBC and CNET and their
respective successors and permitted assigns.

          8.  NOTICES.  All notices and other communications given or made
pursuant hereto shall be in writing and shall be deemed to have been duly
given or made if and when

<PAGE>
                                                                            7

delivered personally or by overnight courier or sent by electronic
transmission, with confirmation received, to the telecopy numbers specified
below:

        If to NBC:

        National Broadcasting Company
        30 Rockefeller Plaza
        New York, New York 10012
        Attention: Marty Yudkovitz

        Telecopy: (212) 661-5561

        With copies to:

        Simpson Thacher & Bartlett
        425 Lexington Avenue
        New York, New York  10017
        Attention: Richard Capelouto

        Telecopy: (212) 455-2502

        If to CNET:

        CNET, Inc.
        150 Chestnut Street
        San Francisco, California  94111
        Attention: Douglas N. Woodrum

        Telecopy:  (415) 395-9205

        with copies to:

        Hughes & Luce, L.L.P.
        1717 Main Street, Suite 2800
        Dallas, Texas  75201
        Attention: R. Clayton Mulford

        Telecopy: (214) 939-5849

or to such other address or telecopy number as any party may have furnished
to the other parties in writing in accordance herewith.

<PAGE>
                                                                            8

          9.  NOTICE OF LITIGATION.  CNET shall promptly notify NBC of any
pending or, to its knowledge, threatened action or proceeding challenging the
validity or enforceability of this Agreement or the ability of CNET to
perform its obligations hereunder.

          10.  SPECIFIC PERFORMANCE.  The parties hereto agree that
irreparable harm would occur in the event that any of the provisions of this
Agreement were not performed in accordance with its specific terms or were
otherwise breached. It is accordingly agreed that the parties shall be
entitled to an injunction or injunctions to prevent breaches of this
Agreement and to enforce specifically the terms and provisions hereof in any
court of the United States or any state thereof having jurisdiction, this
being in addition to any other remedy to which they are entitled at law or in
equity.

          11.  AMENDMENT.  This Agreement may not be amended or modified,
except by an instrument in writing signed by or on behalf of each of the
parties hereto.  This Agreement may not be waived by any party hereto, except
by an instrument in writing signed by or on behalf of the party granting such
waiver.

          12.  GOVERNING LAW.  This Agreement shall be governed by and
construed in accordance with the laws of the State of Delaware without giving
effect to the principles of conflicts of law.

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

          14.  TERMINATION.  This Agreement shall terminate upon the date on
which CNET and its affiliates do not beneficially own (as determined pursuant
to Rule 13d-3 under the Exchange Act) in the aggregate at least 5% of the
Company Common Stock outstanding.  Upon any termination of this Agreement,
this Agreement shall thereupon become void and of no further force and
effect, and there shall be no liability in respect of this Agreement or of
any transactions contemplated hereby on the part of any party hereto or any
of its directors, officers, partners, stockholders, employees, agents,
advisors, representatives or affiliates; PROVIDED, HOWEVER, that nothing
herein shall relieve any party from any liability for such party's wilful
breach of any of its material agreements contained in this Agreement; and
PROVIDED FURTHER that nothing herein shall limit, restrict, impair, amend or
otherwise modify the rights, remedies, obligations or liabilities of any
person under any other contract or agreement.

          15.  SEVERABILITY.  Any term or provision of this Agreement which
is invalid or unenforceable in any jurisdiction shall, as to that
jurisdiction, be ineffective to the extent of such invalidity or
unenforceability and shall not render invalid or unenforceable the remaining
terms and provisions of this Agreement or affect the validity or
enforceability of any of the terms or provisions of this Agreement in any
other jurisdiction.  If any provision of this Agreement is so broad as to be
unenforceable, the provision shall be interpreted to be only so broad as is
enforceable.

<PAGE>
                                                                            9

          IN WITNESS WHEREOF, this Agreement has been executed by or on behalf
of each of the parties hereto, all as of the date first above written.

                        NATIONAL BROADCASTING COMPANY

                        By:     /s/ Mark Begor
                            -------------------------------------
                             Name:  Mark Begor
                             Title:  Executive Vice President

                        CNET, INC.

                        By:      /s/ Douglas N. Woodrum
                            -------------------------------------
                             Name:    Douglas N. Woodrum
                             Title:   CFO

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