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                                                                   EXHIBIT 10.34

                                LOCK-UP AGREEMENT

          THIS LOCK-UP AGREEMENT (this "Agreement") is entered into as of June
__, 2001 by and among E-Stamp Corporation, a Delaware corporation ("E-Stamp"),
Learn2.com, Inc., a Delaware corporation ("Learn2"), and the undersigned (the
"Stockholder").

          WHEREAS, E-Stamp and Learn2 have entered into an Agreement and Plan of
Merger (the "Merger Agreement"), dated April 19, 2001, which provides, among
other things, for the merger (the "Merger") of Learn2 with and into E-Stamp
pursuant to the terms and conditions thereof;

          WHEREAS, E-Stamp, Learn2 and RGC International Investors, LDC ("RGC")
have entered into a Redemption and Termination Agreement (the "Redemption
Agreement"), dated April 19, 2001 which provides, among other things, for
certain trading limitations on the shares of E-Stamp Common Stock to be received
by RGC in the Merger (the "RGC Trading Limitations");

          WHEREAS, the Stockholder is currently an officer or director of Learn2
or E-Stamp;

          WHEREAS, the Redemption Agreement provides that the applicability of
the RGC Trading Limitations to RGC is contingent upon the Stockholder's
execution of this Agreement; and

          WHEREAS, the Stockholder desires that the RGC Trading Limitations
shall apply to RGC.

          NOW, THEREFORE, the parties hereto, in consideration of the foregoing,
the mutual covenants and agreements contained herein and for other good and
valuable consideration, the receipt and sufficiency of which hereby are
acknowledged, and intending to be legally bound hereby, agree as follows:

          SECTION 1. DEFINITIONS.

          For purposes of this Agreement, "SALE" shall mean the sale,
assignment, transfer, or other disposition of, or the entering into of any
contract, option or other agreement or understanding (including, without
limitation, any short sale (whether or not against the box) or any purchase,
sale or grant of any right (including, without limitation, any put or call
option) with respect to any security (other than a broad-based market basket or
index) that includes, relates to or derives any significant part of its value
from E-Stamp Common Stock) with respect to the direct or indirect sale,
assignment, transfer or other disposition of shares of E-Stamp Common Stock.

          SECTION 2. TRADING LIMITATIONS.

               (a)  In the event that the Merger is consummated, the Stockholder
agrees that:

                    (i)  he will conduct any Sales of E-Stamp Common Stock in
compliance with all relevant securities laws and regulations and will not create
any daily low trading prices in the E-Stamp Common Stock,

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                    (ii) until one hundred eighty (180) days from the closing of
the Merger, he will not engage in any Sales of E-Stamp Common Stock, and

                    (iii) during the period beginning one hundred and eighty
(180) days from the closing of the Merger and ending on the one (1) year
anniversary of the closing of the Merger, his Sales of E-Stamp Common Stock in
any calendar month will not exceed 5% of the lesser of (A) the total trading
volume of the E-Stamp Common Stock for the previous calendar month and (B) the
aggregate number of shares of E-Stamp Common Stock beneficially owned by the
Stockholder immediately following the consummation of the Merger.

               (b)  Notwithstanding the limitation referred to in subpart (B) of
Section 2(a)(iii) above (but subject to the limitation referred to in subpart
(A) of Section 2(a)(iii) above), the Stockholder shall be permitted to sell up
to 5,000 shares of E-Stamp Common Stock (as adjusted for stock splits, stock
dividends and similar events) in any calendar month during the period specified
in Section 2(a)(iii) above.

               (c)  [except for Stephen Gott and Donald Schupak, include the
following:] Notwithstanding the foregoing, the restrictions set forth in this
Section 2 shall expire if the Stockholder's employment with or service to Learn2
or E-Stamp is subsequently terminated, so long as the Stockholder is not (or
would not be following consummation of the Merger), at the time of such
termination, a holder of five percent (5%) or more of the outstanding shares of
E-Stamp Common Stock.

          SECTION 3. MISCELLANEOUS.

               (a)  Termination. In the event that the Merger Agreement is
terminated in accordance with its terms, this Agreement will terminate and be of
no further force and effect.

               (b)  Waiver; Severability. No waiver by any party hereto of any
condition or of any breach of any provision of this Agreement shall be effective
unless in writing and signed by each party hereto. In the event that any
provision of this Agreement, or the application of any such provision to any
person, entity or set of circumstances, shall be determined to be invalid,
unlawful, void or unenforceable to any extent, the remainder of this Agreement,
and the application of such provision to persons, entities or circumstances
other than those as to which it is determined to be invalid, unlawful, void or
unenforceable, shall not be impaired or otherwise affected and shall continue to
be valid and enforceable to the fullest extent permitted by law.

               (c)  Binding Effect and Assignment. This Agreement and all of the
provisions hereof shall be binding upon and inure to the benefit of the parties
hereto and their respective successors and permitted assigns, but, except as
otherwise specifically provided herein, neither this Agreement nor any of the
rights, interests or obligations of the parties hereto may be assigned by either
of the parties without prior written consent of the other party hereto.

               (d)  Amendments and Modification. This Agreement may not be
modified, amended, altered or supplemented except upon the execution and
delivery of a written agreement executed by the parties hereto.

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               (e)  Injunctive Relief. Each of the parties acknowledge that (i)
the covenants and the restrictions contained in this Agreement are necessary,
fundamental, and required for the protection of E-Stamp and Learn2 and to
preserve for E-Stamp and Learn2 the benefits of the Merger; (ii) such covenants
relate to matters which are of a special, unique, and extraordinary character
that gives each of such covenants a special, unique, and extraordinary value;
and (iii) a breach of any such covenants or any other provision of this
Agreement shall result in irreparable harm and damages to E-Stamp and Learn2
which cannot be adequately compensated by a monetary award. Accordingly, it is
expressly agreed that in addition to all other remedies available at law or in
equity, E-Stamp and Learn2 shall be entitled to the immediate remedy of a
temporary restraining order, preliminary injunction, or such other form of
injunctive or equitable relief as may be used by any court of competent
jurisdiction to restrain or enjoin any of the parties hereto from breaching any
such covenant or provision or to specifically enforce the provisions hereof.

               (f)  Governing Law. This Agreement shall be governed by and
construed, interpreted and enforced in accordance with the internal laws of the
State of Delaware without giving effect to any choice or conflict of law
provision or rule (whether of the State of Delaware or any other jurisdiction)
that would cause the application of the laws of any jurisdiction other than the
State of Delaware.

               (g)  Entire Agreement. This Agreement sets forth the entire
understanding of the Stockholder and E-Stamp and Learn2 relating to the subject
matter hereof and supersedes all prior agreements and understandings between the
Stockholder and E-Stamp and Learn2 relating to the subject matter hereof.

               (h)  Attorneys' Fees. In the event of any legal actions or
proceeding to enforce or interpret the provisions hereof, the prevailing party
shall be entitled to reasonable attorneys' fees, whether or not the proceeding
results in a final judgment.

               (i)  Counterparts. This Agreement shall be executed in one or
more counterparts, each of which shall be deemed an original, and all of which
together shall constitute one and the same instrument.

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          IN WITNESS WHEREOF, the undersigned have caused this Agreement to be
duly executed as of the date first above written.

     E-STAMP CORPORATION

     By:
        --------------------------------------------

     Name:
          ------------------------------------------

     Title:
           -----------------------------------------

     LEARN2.COM, INC.

     By:
        --------------------------------------------

     Name:
          ------------------------------------------

     Title:
           -----------------------------------------

     STOCKHOLDER

     -----------------------------------------------

     Print Name:
                ------------------------------------

                     [Signature Page to Lock-Up Agreement]<PAGE>   1
                                                                     EXHIBIT 4.2

                                    AMENDMENT

                       TO THE CARDIAC PATHWAYS CORPORATION

                        PREFERRED SHARES RIGHTS AGREEMENT

                                  JULY 23, 1999

        WHEREAS, Cardiac Pathways Corporation (the "Company") and Norwest Bank
Minnesota, N.A. (the "Rights Agent") are parties to the Preferred Shares Rights
Agreement, dated as of April 22, 1997 (the "Rights Agreement");

        WHEREAS, the Company's Board of Directors has authorized the designation
and sale of the Company's Series B Convertible Preferred Stock;

        WHEREAS, the Company has determined that pursuant to Section 27 of the
Rights Agreement, the Rights Agreement may be amended as set forth herein
without the approval of the holders of the Rights (as defined in the Rights
Agreement);

        NOW THEREFORE, in consideration of the promises and mutual agreements
set forth in the Rights Agreement, the parties hereby amend the Rights Agreement
as follows:

1.      The definition of "Acquiring Person" set forth in Section 1(a) is hereby
amended, in its entirety, to provide as follows:

        "ACQUIRING PERSON" shall mean any Person who or which, together with all
Affiliates and Associates of such Person, shall be the Beneficial Owner of 15%
or more of the Common Shares then outstanding, but shall not include the
Company, any Subsidiary of the Company or any employee benefit plan of the
Company or of any Subsidiary of the Company, or any entity holding Common Shares
for or pursuant to the terms of any such plan; provided, however that no Series
B Party (as defined below) shall be deemed an "Acquiring Person" as a result of
its being the Beneficial Owner of any securities (any such securities, "Series B
Securities") issued or issuable pursuant to the Series B Convertible Preferred
Stock Purchase Agreement and Securities Purchase Agreement (including the
exhibits that are a part thereof, and in particular including any Common Shares
which have been or may be issued upon conversion of shares of preferred stock
issued thereunder, issued upon exercise of the warrants granted thereby or
otherwise issued in accordance with the terms of such agreements or related
documents) each dated as of May 20, 1999 between the Company and the Purchasers
named therein. Notwithstanding the foregoing, no Person shall be deemed to be an
Acquiring Person as the result of an acquisition of Common Shares by the Company
which, by reducing the number of shares outstanding, increases the proportionate
number of shares beneficially owned by such Person to 15% or more of the Common
Shares of the Company then outstanding; provided, however, that if a Person
shall become the Beneficial Owner of 15% or more of the Common Shares of the
Company then outstanding by reason of share purchases by the Company and shall,
after such share purchases by the Company, become the Beneficial Owner of

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any additional Common Shares of the Company (other than pursuant to a dividend
or distribution paid or made by the Company on the outstanding Common Shares in
Common Shares or pursuant to a split or subdivision of the outstanding Common
Shares), then such Person shall be deemed to be an Acquiring Person unless upon
becoming the Beneficial Owner of such additional Common Shares of the Company
such Person does not beneficially own 15% or more of the Common Shares of the
Company then outstanding. Notwithstanding the foregoing, (i) if the Company's
Board of Directors determines in good faith that a Person who would otherwise be
an "Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), has become such inadvertently (including, without limitation,
because (A) such Person was unaware that it beneficially owned a percentage of
the Common Shares that would otherwise cause such Person to be an "Acquiring
Person," as defined pursuant to the foregoing provisions of this paragraph (a),
or (B) such Person was aware of the extent of the Common Shares it beneficially
owned but had no actual knowledge of the consequences of such beneficial
ownership under this Agreement) and without any intention of changing or
influencing control of the Company, and if such Person divested or divests as
promptly as practicable a sufficient number of Common Shares so that such Person
would no longer be an "Acquiring Person," as defined pursuant to the foregoing
provisions of this paragraph (a), then such Person shall not be deemed to be or
to have become an "Acquiring Person" for any purposes of this Agreement; and
(ii) if, as of the date hereof, any Person is the Beneficial Owner of 15% or
more of the Common Shares outstanding, such Person shall not be or become an
"Acquiring Person," as defined pursuant to the foregoing provisions of this
paragraph (a), unless and until such time as such Person shall become the
Beneficial Owner of additional Common Shares (other than pursuant to a dividend
or distribution paid or made by the Company on the outstanding Common Shares in
Common Shares or pursuant to a split or subdivision of the outstanding Common
Shares), unless, upon becoming the Beneficial Owner of such additional Common
Shares, such Person is not then the Beneficial Owner of 15% or more of the
Common Shares then outstanding. A "Series B Party" shall include each of (i)
Bank America Ventures, Morgan Stanley Venture Partners III, L.P., Morgan Stanley
Venture Investors III, L.P., Morgan Stanley Venture Partners Entrepreneur Fund,
L.P., Van Wagoner Capital Management, State of Wisconsin Investment Board,
Thomas J. Fogarty and Trellis Health Ventures L.P. (the "Purchasers") (ii) any
Affiliate of a Purchaser, (iii) any creditor of a Purchaser who acquires Series
B Securities upon the exercise of creditor rights in connection with a bona fide
credit arrangement, and (iv) any other person who acquires Series B Securities
provided that such person has stated or intends to state in a timely fashion in
a filing pursuant to Regulation 13D-G under the Securities Exchange Act of 1934,
as amended, or any successor provision thereto, that such person has acquired
such securities in the ordinary course of business and not with the purpose or
effect of changing or influencing control of the Company, nor in connection with
or as a participant in any transaction having such purpose or effect, including
any transaction subject to Rule 13d-3(b).

2.      The definition of "Common Shares" set forth in Section 1(g) is hereby
amended, in its entirety, to provide as follows:

        "COMMON SHARES" when used with reference to the Company shall mean the
shares of Common Stock of the Company, $.001 par value, and the shares of Series
B Convertible Preferred Stock, $.001 par value. Common Shares when used with
reference to any Person other than the Company shall mean the capital stock (or
equity interest) with the greatest voting power of such

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other Person or, if such other Person is a Subsidiary of another Person, the
Person or Persons which ultimately control such first-mentioned Person.

3.      This Amendment may be executed in counterparts each of which shall be
deemed an original and all of which shall constitute one instrument.

4.      Except as expressly amended by this Amendment, all provisions of the
Rights Agreement shall remain in full force and effect.

                  [Remainder of Page Intentionally Left Blank]

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        IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed as of the day and year first above written.

                                 CARDIAC PATHWAYS CORPORATION

                                 By: /s/ G. Michael Latta
                                     -------------------------------------------
                                     G. Michael Latta, Chief Financial Officer

                                 NORWEST BANK MINNESOTA, N.A.

                                 By: /s/ Karri L. Van Dell
                                     -------------------------------------------
                                     Karri L. Van Dell, Assistant Vice President

                                   CERTIFICATE

        The undersigned officer of Cardiac Pathways Corporation certifies that
this Amendment is in compliance with the terms of Section 27 of the Rights
Agreement.

/s/ G. Michael Latta
------------------------------------------
G. Michael Latta, Chief Financial Officer

                                [Signature Page]

        [Amendment to the Cardiac Pathways Corporation Preferred Shares
                               Rights Agreement]

                                      -4-

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