Document:

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                                                                   EXHIBIT 10.66

                          AMENDED OVERADVANCE LC RIDER

      This Amended Overadvance LC Rider is dated October 31, 2003, and is
attached to and forms a part of the Accounts Receivable Financing Agreement
dated as of June 13, 2003 (the "Accounts Agreement") between Proxim Corporation
("Borrower") and Silicon Valley Bank ("Bank"), and amends in its entirety the
prior Overadvance LC Rider to the Accounts Agreement effective on the date
hereof.

      1. Overadvance LCs.

         (a) Bank may, in its good faith business judgment, provide Borrower
with Letters of Credit in excess of the formulas set forth in the Accounts
Agreement (the "Overadvance LCs"), as set forth in this Rider. (If a Letter of
Credit is 100% secured by cash or is 100% reserved for from Advances which would
otherwise be available to the Borrower under the Accounts Agreement (after all
other reserves), such Letter of Credit will not be deemed an Overadvance LC. If
only part of the face amount of a Letter of Credit is secured by cash or is so
reserved, then such Letter of Credit shall only be deemed an Overadvance LC to
the extent such Letter of Credit is not cash secured and not covered by such
reserves.)

         (b) The unpaid balance of all Overadvance LCs from time to time
outstanding shall not at any time exceed $4,000,000, and in the event it does,
at any time, Borrower will provide Bank with cash collateral in an amount equal
to 100% of the excess immediately, without notice or demand.

         (c) In no event shall the total Obligations (including without
limitation the Overadvance LCs exceed $20,000,000.

      2. Overadvance Maturity Date.

         (a) Overadvance LCs may be outstanding only during the period from the
date hereof to the earlier of the following (the "Overadvance Maturity Date"):
October 31, 2003 or the date the Accounts Agreement terminates by its terms or
is terminated by any party in accordance with its terms.

         (b) On and after the Overadvance Maturity Date, the Overadvance
facility established by this Rider will expire, and no further Overadvance LCs
will be issued. On or before the Overadvance Maturity Date, Borrower shall
provide Bank with cash collateral in an amount equal to 100% of the face amount
of all outstanding Overadvance LCs (including without limitation drawn, but
unreimbursed Overadvance LCs). All cash collateral provided pursuant to this
Rider shall be held as "Collateral" for all purposes of the Accounts Agreement.
In the event, on the Overadvance Maturity Date, Borrower fails to provide Bank
with cash collateral in an amount equal to 100% of the face amount of all
outstanding Overadvance LCs, such failure shall constitute an Event of Default
under the Accounts Agreement.
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      3. Fees. Borrower shall pay all standard charges with respect to
Overadvance LCs as are charged by Bank's International Department. In addition,
Borrower shall pay Bank a fee in the amount of 1.5% per Week of the average
amount of Overadvance LCs outstanding during each Week, which shall be payable
on the last day of each Week. As used herein, "Week" means the seven-day period
beginning on the date of this Rider and each succeeding seven-day period. Said
fee shall be in addition to all interest and all other fees and charges, and may
be charged by Bank to any of Borrower's deposit accounts with Bank or to
Borrower's loan account.

      4. Collateral. The Obligation to reimburse Bank for all Overadvance LCs,
and all of Borrower's other obligations under this Rider shall for all purposes
be deemed "Obligations" under the Accounts Agreement and shall be secured by all
of the Collateral. All Overadvance LCs shall, for all purposes, be deemed to be
"Letters of Credit" under the Accounts Agreement, and all Overadvance LCs shall
be entitled to all of the benefits of, and (except as herein expressly set
forth) shall be subject to all of the terms and provisions of, all of the Loan
Documents.

Borrower:                                   Bank:

PROXIM CORPORATION                          SILICON VALLEY BANK

By /s/ David L. Thompson                       By (illegible)
  -----------------------------------             ------------------------------
      President or Vice President           Title
                                                  ------------------------------

By /s/ Richard J. Tellman
  -----------------------------------
      Secretary or Ass't Secretary

                                                                             -2-<PAGE>
                                                                   EXHIBIT 10.67

SILICON VALLEY BANK

                        AMENDMENT TO OVERADVANCE LC RIDER

BORROWER:         PROXIM CORPORATION

DATED AS OF:      MARCH 31, 2004

         This Amendment to Overadvance LC Rider is entered into between Silicon
Valley Bank ("Bank") and the borrower named above ("Borrower"), with reference
to the following facts:

         Bank and the Borrower are parties to the following: the Loan and
Security Agreement between them, dated December 27, 2002 (the "Loan Agreement"),
the Accounts Receivable Financing Agreement dated June 13, 2003 (the "Accounts
Agreement"), the Amended Overadvance LC Rider dated October 31, 2003 to the
Accounts Agreement (the "Overadvance LC Rider"), and the documents, instruments
and agreements relating thereto (with the Loan Agreement, the Accounts
Agreement, and the Overadvance LC Rider, collectively, the "Loan Documents").

(Capitalized terms used but not defined in this Amendment, shall have the
meanings set forth in the Accounts Agreement.)

         The parties agree as follows:

         1. EXTENSION. Section 2(a) of the Overadvance LC Rider, is amended by
replacing the date "March 31, 2004" therein with the date "May 31, 2004", so
that it reads as follows:

                  "(a) Overadvance LCs may be outstanding only during the period
                  from the date hereof to the earlier of the following (the
                  "Overadvance Maturity Date"): May 31, 2004 or the date the
                  Accounts Agreement terminates by its terms or is terminated by
                  any party in accordance with its terms."

         2. FEE. In consideration for Bank entering into this Amendment,
Borrower shall concurrently pay Silicon a fee in the amount of $5,000, which is
fully earned on the date hereof, is non-refundable and is in addition to all
interest and other fees and charges payable to Silicon. Silicon is authorized to
charge said fee to Borrower's loan account or to any of Borrower's deposit
accounts.

         3. REPRESENTATIONS TRUE. Borrower represents and warrants to Bank that
all representations and warranties set forth in the Accounts Agreement, as
amended hereby, and the

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other Loan Documents (other than the Loan Agreement, the representations in
which were replaced by those in the Accounts Agreement) are true and correct.

         4. GENERAL PROVISIONS. This Amendment, and the other Loan Documents set
forth in full all of the representations and agreements of the parties with
respect to the subject matter hereof and supersede all prior discussions,
representations, agreements and understandings between the parties with respect
to the subject hereof. Except as herein expressly amended, all of the terms and
provisions of the Overadvance LC Rider, and all other Loan Documents shall
continue in full force and effect and the same are hereby ratified and
confirmed.

         IN WITNESS WHEREOF, the parties hereto have executed this Amendment to
Overadvance LC Rider as of the date first above written.

Borrower:                                    Bank:

PROXIM CORPORATION                           SILICON VALLEY BANK

By /s/ Michael Angel                         By (illegible)
  ------------------------------               ---------------------------------
      President or Vice President            Title
                                                  ------------------------------

                                     CONSENT

         Each of the undersigned acknowledges that its consent to the foregoing
Amendment is not required, but the undersigned nevertheless do hereby consent to
the foregoing Amendment and to the documents and agreements referred to therein
and to all future modifications and amendments thereto, and any termination
thereof, and to any and all other present and future documents and agreements
between or among the foregoing parties. Nothing herein shall in any way limit
any of the terms or provisions of the Continuing Guaranty of the undersigned,
all of which are hereby ratified and affirmed.

Proxim Wireless Networks, Inc.                   Wirelesshome Corporation

By /s/ Michael Angel                             By /s/ Michael Angel
  ------------------------------------             -------------------------
Name  Michael Angel                              Name Michael Angel
    ----------------------------------               -------------------------
Title EVP & CFO                                  Title EVP & CFO
     ---------------------------------                -------------------------

Proxim International Holdings, Inc.
(formerly Western Multiplex International
Holdings, Inc.)

By /s/ Michael Angel
  ---------------------------------------------------

                                                                             -2-
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Name Michael Angel
    ---------------------
Title EVP & CFO
     --------------------

                                                                             -3-exv4w2

 

Exhibit 4.2

Amendment to the Philadelphia Consolidated Holding Corp.

Employees’ Stock Option Plan

(effective March 24, 2004)

     WHEREAS, the Board of Directors (the “Board”) of Philadelphia Consolidated
Holding Corp., a Pennsylvania corporation (the “Company”) has determined to
amend certain provisions of the Philadelphia Consolidated Holding Corp.
Employees’ Stock Option Plan (the “Plan”) in order to increase the number of
shares available for the grant of options under the Plan; and

     WHEREAS, the Board is authorized to amend the Plan, at its discretion,
from time to time pursuant to Section 6 of the Plan.

     NOW, THEREFORE, the Plan is hereby amended, effective as of March 24,
2004, and subject to approval of such amendment by the Company’s shareholders,
as follows:

     1. The first paragraph of Section 4 of the Plan is hereby amended to read,
in its entirety as follows:

     “4. Stock Subject to Options. Subject to
adjustment in accordance with paragraph 12, options to
purchase a total of 5,500,000 shares of Common Stock
(taking into account options previously granted under
this Plan prior to this amendment and restatement) are
authorized for issuance under this Plan. If, and to
the extent that, stock options granted under this Plan
(“Options”) terminate or expire without the Options
being exercised, new options may be granted with
respect to the shares covered by such terminated or
expired Options provided that the granting and terms
of such new Options shall in all respects comply with
the provision of this Plan.”

     2. In all other respects, the Plan is hereby ratified and confirmed.

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