Document:

<PAGE>
                                                                   EXHIBIT 10.93

                          Williams Communications, LLC
                           One Williams Center, MD 26
                           Tulsa, Oklahoma 74172-0712

                                                      October 11, 2001

iBEAM Broadcasting Corporation
645 Almanor Avenue, Suite 100
Sunnyvale, CA 94085

Ladies and Gentlemen:

         Reference is made to the Debtor-in Possession Term Credit and Security
Agreement (the "Agreement"), dated as of October 11, 2001, among iBEAM
Broadcasting Corporation, a Delaware corporation (the "Borrower"), debtor and
debtor-in-possession in a case pending under Chapter 11 of the Bankruptcy Code
(the "Case") and Williams Communications, LLC ("Williams"), a Delaware limited
liability company, as lender (in such capacity, the "Lender").

         Capitalized terms used herein and not otherwise defined herein shall
have the meanings assigned to such terms in the Agreement.

         You agree to pay to the Lender a facility fee equal to 0.50% of the
Commitment (the "Facility Fee") on the Closing Date.

         On the date (the "Termination Date") of the consummation of the sale by
the Borrower of substantially all of its assets to Williams pursuant to Section
363 of the Bankruptcy Code, as contemplated by and in accordance with the Asset
Sale Agreement, the amount of the outstanding Obligations required to be repaid
by the Borrower to the Lender on the Termination Date shall be decreased by the
amount of the Facility Fee.

         You agree that, except as set forth above, once paid, the Facility Fee
or any part thereof payable hereunder shall not be refundable under any
circumstances, regardless of whether the transactions contemplated by Asset Sale
Agreement are consummated. The Facility Fee payable hereunder shall be paid in
immediately available funds and shall be in addition to reimbursement of the
Lender's out-of-pocket expenses.

<PAGE>

         This Fee Letter is the fee letter referred to in Section 2.11 of the
Agreement. The Facility Fee is in addition to, and not in lieu of, any other
fees charged to Borrower under the Agreement and the other Loan Documents.

         This Fee Letter may not be amended or waived except by an instrument in
writing signed by the Lender and you. This Fee Letter shall be governed by, and
construed in accordance with, the laws of the State of New York. This Fee Letter
may be executed in any number of counterparts, each of which shall be an
original, and all of which, when taken together, shall constitute one agreement.
Delivery of an executed signature page of this Fee Letter by facsimile
transmission shall be effective as delivery of a manually executed counterpart
hereof.

         You agree that this Fee Letter and its contents are subject to the
confidentiality provisions of the Agreement.

                  [Remainder of page intentionally left blank]

                                        2

<PAGE>

                                            WILLIAMS COMMUNICATIONS, LLC

                                            /s/ JOHN BUMGARNER
                                            -------------------------------
                                            Name:
                                            Title:

Accepted and Agreed to by:

iBEAM BROADCASTING CORPORATION

/s/ PETER DESNOES
-------------------------------
Name:
Title:

                                        3<PAGE>
                                                                   EXHIBIT 10.94

                          WILLIAMS COMMUNICATIONS, LLC
                       WILLIAMS COMMUNICATIONS GROUP, INC.
                               ONE WILLIAMS CENTER
                                   SUITE 2600
                              TULSA, OKLAHOMA 74172

                                                          as of October 30, 2001

Bank of America, N.A., as Administrative Agent
Bank of America Plaza
901 Main St., 64th Floor
Dallas, TX 75202-3714

The Chase Manhattan Bank, as Syndication Agent
270 Park Avenue
New York, NY  10017

Salomon Smith Barney Inc., as Co-Documentation Agent
390 Greenwich Street
New York, NY 10013

Lehman Brothers, Inc., as Co-Documentation Agent
3 World Financial Center
200 Vesey Street
New York, NY 10281

Merrill Lynch & Co., Inc., as Co-Documentation Agent
World Financial Center
North Tower
250 Vesey Street
New York, NY 10281

Ladies and Gentlemen:

Reference is hereby made to that certain Amended and Restated Credit Agreement
dated as of September 8, 1999 (as amended, the "Credit Agreement"), among
Williams Communications, LLC, as Borrower (the "Borrower"), Williams
Communications Group, Inc., as Guarantor ("Holdings"), the lenders party thereto
(the "Lenders"), Bank of America, N.A., as Administrative Agent for the Lenders
(in such capacity, the "Administrative Agent"), The Chase Manhattan Bank, as
Syndication Agent, Salomon Smith Barney Inc. and Lehman Brothers, Inc., as Joint
Lead Arrangers and Joint Bookrunners with respect to the Incremental Facility
referred to therein, and Salomon Smith Barney Inc., Lehman Brothers, Inc. and
Merrill Lynch & Co., Inc., as Co-Documentation Agents. All capitalized terms
used herein and not otherwise defined, and the term "subsidiary", shall have the
meanings given to such terms in the Credit Agreement.

The execution and delivery of this letter agreement is a condition precedent to
the effectiveness of Amendment No. 6 dated as of October 30, 2001 ("Amendment
No. 6") to the Credit Agreement, and is being entered into pursuant to Section
4(A) of such Amendment No. 6.

<PAGE>

In consideration of the amendments to the Credit Agreement set forth in
Amendment No. 6 and for other good and valuable consideration the receipt of
which is hereby acknowledged, each of the Loan Parties hereby agrees as follows:

         1. During the period (the "Negotiation Period") beginning as of October
         19, 2001 and ending on the earlier of (i) January 15, 2002 and (ii) the
         effective date of the Seventh Amendment (as defined in Section 3(C) of
         Amendment No. 6), each of the Loan Parties shall not, and shall not
         permit any Unrestricted Subsidiary to:

                  (a)      directly or indirectly redeem, purchase or otherwise
                           acquire any notes or other indebtedness issued by
                           Holdings, the Borrower or any of their subsidiaries
                           or Affiliates, or

                  (b)      directly or indirectly pay any cash dividends in
                           respect of, or redeem, purchase or otherwise acquire,
                           any Equity Interests of Holdings, the Borrower or any
                           of their subsidiaries or Affiliates, or

                  (c)      accept as payment on any account receivable or other
                           obligation, any notes, indebtedness or Equity
                           Interest issued by Holdings, the Borrower or any of
                           their subsidiaries or Affiliates;

         provided, however, that Holdings, the Borrower and any Restricted
         Subsidiaries may engage in the following: (i) any intercompany
         transaction undertaken in the ordinary course of business between or
         among Holdings, the Borrower or any of their Restricted Subsidiaries to
         the extent such transaction is expressly permitted by the Credit
         Agreement; (ii) with the prior written consent of the Agents, the
         issuance of equity securities of Holdings in exchange or substitution
         for outstanding debt securities issued by and against Holdings or the
         Borrower; and (iii) to the extent such transactions are expressly
         permitted by the Credit Agreement (x) the publicly announced
         acquisition by the Borrower of the assets of iBEAM Broadcasting Corp
         ("iBeam"), which is currently a debtor before the United States
         Bankruptcy Court for the District of Delaware and related iBeam
         transactions, and (y) investments made during the Negotiation Period,
         in an amount not exceeding $12 million in the aggregate, in PowerTel
         Limited, Silica Networks, S.A. and Manquehue Net, S.A.

         2. During the Negotiation Period, the Borrower, Holdings and their
         subsidiaries shall fund their business and operations in accordance
         with the preliminary budget dated October 1, 2001; provided, however,
         that it is understood and agreed that the Borrower may request (and the
         Issuing Bank shall issue) Letters of Credit pursuant to, and in
         accordance with, the Credit Agreement for transactions in the ordinary
         course of the Borrower's business consistent with past practices and
         for purposes similar to those purposes for which the Borrower has
         obtained Letters of Credit in the past, provided, that in no event
         shall there be more than $15 million in face amount of Letters of
         Credit outstanding at any one time during the Negotiation Period.

         3. During the Negotiation Period (except as otherwise agreed to in
         writing by the Agents), each of the Loan Parties:

                  (a)      shall not make any investment (including, without
                           limitation, loans) in any Unrestricted Subsidiaries
                           or any Foreign Subsidiaries, except as expressly
                           provided in clause (iii)(y) of the proviso appearing
                           in paragraph 1 above,

                  (b)      shall cause the Unrestricted Subsidiaries to maintain
                           at all times, all Unrestricted Subsidiaries' cash and
                           cash equivalents in separate identifiable securities
                           or

                                      -2-
<PAGE>

                           deposit accounts and shall not permit any such cash
                           or cash equivalents to be commingled with any funds
                           or other assets of any Loan Party,

                  (c)      shall not permit any Unrestricted Subsidiary to
                           conduct any business or make any investments that are
                           not expressly permitted by the Credit Agreement;
                           provided, that in no event shall any investment
                           permitted by this paragraph 3(c) include any
                           transaction prohibited by paragraph 1 above and
                           provided, further, that any investment permitted by
                           this paragraph 3(c) shall be subject to the
                           limitation in paragraph 3(d) below, and

                  (d)      shall not permit the Unrestricted Subsidiaries to
                           hold at any time an aggregate amount in excess of $30
                           million of the items described in the following
                           clauses (i) and (ii) (the "Permitted Basket"): (i)
                           cash and cash equivalents plus (ii) the purchase
                           price of all investments made on or after October 19,
                           2001 (the "New Investments"); it being understood
                           that (w) there shall not be a default under this
                           provision so long as any amounts in excess of such
                           $30 million limit are remitted to the Borrower in
                           compliance with the provisions of paragraph 4 below;
                           (x) the Permitted Basket shall not include any
                           additional investment by Holdings, Borrower or any
                           other Loan Party beyond the original $30 million; (y)
                           nothing herein shall prevent the Unrestricted
                           Subsidiaries from liquidating any New Investments
                           held in the Permitted Basket to cash and reinvesting
                           the proceeds thereof so long as the cash and cash
                           equivalents plus the purchase price of all New
                           Investments in the Permitted Basket shall not exceed
                           $30 million at any time and any net loss from the
                           liquidation of New Investments shall be charged
                           against the Permitted Basket (it being further
                           understood that Unrestricted Subsidiaries have no
                           obligation to mark-to-market or otherwise value and
                           recognize losses in respect of any New Investment
                           that is not, in fact, liquidated); and (z) the
                           Permitted Basket is to be used by the Unrestricted
                           Subsidiaries for their operations and to make any
                           investments permitted hereby and by the express terms
                           of the Credit Agreement and that any cash, cash
                           equivalents and proceeds of investments received
                           after the date hereof shall be remitted to the
                           Borrower pursuant to paragraph 4 below;

         provided, however, that subject to paragraph 4 below, the foregoing
         shall not prohibit the Borrower, Holdings and each other Restricted
         Subsidiary, to the extent expressly permitted by the Credit Agreement,
         from performing the obligations to pay interest and other amounts due
         and owing on and otherwise to comply with the requirements of the
         Structured Note Financing or of any debt securities issued by and
         outstanding against Holdings; provided, that Holdings shall cause WCG
         Note Trust to remit to the Borrower the amount of any payment made by
         Holdings to WCG Note Trust in excess of the amounts required by WCG
         Note Trust to perform and comply with its obligations in connection
         with the Structured Note Financing.

         4. During the Negotiation Period, in the event that either (a) the
         aggregate amount of cash and cash equivalents held by the Unrestricted
         Subsidiaries plus the aggregate amount of the purchase price of New
         Investments by the Unrestricted Subsidiaries in accordance with
         paragraph 3(d) above, exceeds $30 million minus the amount of any net
         loss charged against the Permitted Basket pursuant to paragraph 3(d)
         above or (b) any interest payment is made by Holdings and/or the
         Borrower to an Unrestricted Subsidiary that has purchased or otherwise
         holds indebtedness issued by Holdings and/or the Borrower or (c) any
         amount is required to be remitted to the Borrower pursuant to paragraph
         3 above, then Holdings and/or the Borrower (as applicable) shall,
         within two (2) Business Days of any such event (x) cause Unrestricted
         Subsidiaries to remit to the

                                      -3-
<PAGE>

         Borrower cash in the amount necessary so that the aggregate amount of
         cash and cash equivalents held by the Unrestricted Subsidiaries plus
         the aggregate amount of the purchase price of all New Investments by
         the Unrestricted Subsidiaries does not exceed $30 million minus the
         amount of any net loss charged against the Permitted Basket pursuant to
         paragraph 3(d) above and/or (y) cause the applicable Unrestricted
         Subsidiary to remit to the Borrower any such interest payment received
         by such Unrestricted Subsidiary or other amount required to be remitted
         to the Borrower, subject to the provisos at the end of paragraph 3
         above. All cash received by the Borrower pursuant to the immediately
         preceding sentence shall be deposited by the Borrower in one or more
         Controlled Deposit Accounts (such term being used herein as defined in
         the Security Agreement).

         5. During the Negotiation Period, the Loan Parties shall provide to the
         Agents a written report, on a monthly basis, detailing any investments
         or any other uses of cash by each Unrestricted Subsidiary and including
         copies of account statements.

The Loan Parties hereby agree that in the event any Loan Party or Unrestricted
Subsidiary shall fail to observe or perform any agreement set forth in this
letter agreement, such event shall be an immediate Event of Default under the
Credit Agreement not requiring any notice, lapse of time or other action on the
part of any of the Agents or the Lenders; and the Administrative Agent and/or
the Required Lenders may exercise any and all remedies it or they may have
pursuant to any of the Loan Documents or other applicable law.

No failure on the part of the Administrative Agent, the Issuing Bank or any
Lender to exercise, and no delay in exercising, any right, power or remedy under
this letter agreement shall operate as a waiver thereof, nor shall any single or
partial exercise of any right, power or remedy preclude any other or further
exercise thereof or the exercise of any other right, power or remedy. All
remedies hereunder are cumulative and are not exclusive of any other remedies
provided by applicable law.

THIS LETTER AGREEMENT SHALL BE CONSTRUED IN ACCORDANCE WITH, AND GOVERNED BY,
THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS MADE AND TO BE
PERFORMED WHOLLY WITHIN THE STATE OF NEW YORK.

Any provision of this letter agreement which is invalid, illegal or
unenforceable under the applicable law of any jurisdiction, shall, as to such
jurisdiction, be ineffective to the extent of such invalidity, illegality or
unenforceability without invalidating the remaining provisions hereof, and any
such invalidity, illegality or unenforceability in any jurisdiction shall not
invalidate such provision in any other jurisdiction.

No modification, amendment or waiver of any provision of this letter agreement,
and no consent to any departure by any of the Loan Parties herefrom, shall in
any event be effective unless the same shall be in writing and signed by the
Issuing Bank and all of the Agents, and consented to by the Required Lenders;
and then any such waiver or consent shall be effective only in the specific
instance and for the specific purpose for which given. No notice to, or demand
on, any Loan Party in any case shall entitle any Loan Party to any other or
further notice or demand in the same, similar or other circumstances.

All references herein to any of the parties to this letter agreement shall be
deemed to include the successors and assigns of such party; provided, however,
that none of the Loan Parties may assign any of its rights or obligations
hereunder without the prior written consent of the Agents, the Issuing Bank and
all of the Lenders, and all covenants, promises and agreements by or on behalf
of any of the Loan Parties which are contained herein shall inure to the benefit
of each of the Lenders and to the successors and

                                      -4-
<PAGE>

assigns of any of the Agents, the Issuing Bank and any of the Lenders. Each of
the Lenders is a third party beneficiary of this letter agreement.

This letter agreement shall be a Loan Document pursuant to the Credit Agreement
and shall (unless expressly indicated herein or therein) be construed,
administered, and applied, in accordance with all of the terms and provisions of
the Credit Agreement. This letter agreement shall be deemed to have been jointly
drafted, and no provision of it shall be interpreted or construed for or against
any party hereto because such party purportedly prepared or requested such
provision, any other provision, or the letter agreement as a whole.

This letter agreement may be executed in any number of counterparts and by the
different parties hereto in separate counterparts, each of which when so
executed and delivered shall be deemed to be an original, and all of which, when
taken together, shall constitute but one and the same agreement. Delivery of an
executed signature page to this letter agreement by facsimile shall be as
effective as delivery of a manually executed counterpart of this letter
agreement.

Each of the Loan Parties hereby represents and warrants that upon execution
hereof by the Loan Parties, this letter agreement will constitute the legal,
valid and binding obligation of the Loan Parties, enforceable in accordance with
its terms, except as the enforceability hereof may be limited by applicable
bankruptcy, insolvency, reorganization or other similar laws affecting
creditors' rights generally and by general equitable principles (regardless of
whether the issue of enforceability is considered in a proceeding in equity or
at law).

This letter agreement and Amendment No. 6 represent the entire agreement of the
parties and the Lenders with regard to the subject matter hereof and thereof,
and supersede all prior agreements and understandings, both written and oral,
with respect to the subject matter of this letter agreement and Amendment No. 6.

                                  Very truly yours,

                                  WILLIAMS COMMUNICATIONS, LLC

                                  By:  /s/ HOWARD S. KALIKA
                                      ------------------------------------------
                                      Name: Howard S. Kalika
                                      Title: Vice President and Treasurer

                                  WILLIAMS COMMUNICATIONS GROUP, INC.

                                  By:  /s/ HOWARD S. KALIKA
                                      ------------------------------------------
                                      Name: Howard S. Kalika
                                      Title: Vice President and Treasurer

                                      -5-
<PAGE>

                                     SUBSIDIARY LOAN PARTIES:

                                     CRITICAL CONNECTIONS, INC.
                                     WCS COMMUNICATIONS SYSTEMS, INC.
                                     WCS, INC.
                                     WILLIAMS COMMUNICATIONS OF VIRGINIA, INC.
                                     WILLIAMS COMMUNICATIONS PROCUREMENT, L.L.C.
                                     WILLIAMS COMMUNICATIONS PROCUREMENT, LP
                                     WILLIAMS GLOBAL COMMUNICATIONS
                                          HOLDINGS, INC.
                                     WILLIAMS INTERNATIONAL VENTURES COMPANY
                                     WILLIAMS LEARNING NETWORK, INC.
                                     WILLIAMS LOCAL NETWORK, LLC
                                     WILLIAMS TECHNOLOGY CENTER, LLC
                                     WILLIAMS COMMUNICATIONS AIRCRAFT, LLC

                                     By:  /s/ HOWARD S. KALIKA
                                        ----------------------------------------
                                        Name: Howard S. Kalika
                                        Title: Vice President and Treasurer

ACKNOWLEDGED AND AGREED TO:

BANK OF AMERICA, N.A., as Administrative Agent
and as Issuing Bank

By: /s/ JOHN W. WOODIEL III
   -------------------------------------------------
   Name:  John W. Woodiel III
   Title: Managing Director

THE CHASE MANHATTAN BANK, as Syndication
Agent and as Issuing Bank

By:      /s/ CONSTANCE M. COLEMAN
   --------------------------------------------------
   Name:  Constance M. Coleman
   Title: Vice President

SALOMON SMITH BARNEY INC.,
as Co-Documentation Agent

By:       /s/ JOHN P. JUDGE
    -------------------------------------------------
    Name:  John P. Judge
    Title: Vice President & Director

                                      -6-
<PAGE>

LEHMAN BROTHERS, INC.,
as Co-Documentation Agent

By:       /s/ G. ANDREW KEITH
    -------------------------------------------------
    Name:  G. Andrew Keith
    Title: SVP

MERRILL LYNCH CAPITAL CORPORATION
as Co-Documentation Agent

By:       /s/ CAROL J.E. FEEZEY
    -------------------------------------------------
    Name:  Carol J.E. Feezey
    Title: Vice President

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