Document:

AMENDMENT NO. 5 TO CONVERTIBLE PROMISSORY NOTE

          AMENDMENT NO. 5 TO  CONVERTIBLE  PROMISSORY  NOTE (this  "Agreement"),
dated as of June  14,  2002,  by and  between  eMAGIN  CORPORATION,  a  Delaware
corporation (the "Borrower") and The Travelers Insurance Company (the "Lender"),
each a party to the Note  Purchase  Agreement  (the "Note  Purchase  Agreement")
entered  into as of  August  20,  2001 and a  Convertible  Promissory  Note (the
"Note")  dated August 20, 2001 as amended to date.  All  capitalized  terms used
herein and not  otherwise  defined  herein  shall have the  respective  meanings
provided to such terms in the Note.

                              W I T N E S S E T H :
                              - - - - - - - - - -

          WHEREAS,  the  Amendment  provides  in Section  1.1  thereof  that the
outstanding  principal amount of the Note shall be payable on June 14, 2002 (the
"Maturity Date");

          WHEREAS,  the parties  hereto are currently  engaging in discussion to
renegotiate certain provisions of the Note;

          WHEREAS,  in order to allow such  discussion  to proceed in an orderly
manner,  the  Borrower  has  requested  and the  Lender has agreed to extend the
Maturity Date and amend the Note as set out herein;

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

                                   ARTICLE ONE

                                AMENDMENT TO NOTE

          SECTION 1.1  Amendment  to Note.  By  executing  this  Agreement,  the
Borrower and the Lender hereby agree and acknowledge  that Section 1 of the Note
is hereby amended by deleting "June 14, 2002" and inserting in the place of such
deletion "June 17, 2002"

                                   ARTICLE TWO

                                  MISCELLANEOUS

          SECTION 2.1 Counterparts.This  Agreement may be executed in any number
of counterparts  and by the different  parties hereto on separate  counterparts,
each of which  counterparts when executed and delivered  (including  delivery by
way of  facsimile)  shall  be an  original,  but  all of  which  shall  together
constitute one and the same instrument.  A complete set of counterparts shall be
lodged with the Borrower.

          SECTION 2.2 GOVERNING  LAW. THIS  AGREEMENT  SHALL BE GOVERNED BY, AND
CONSTRUED  AND ENFORCED IN ACCORDANCE  WITH,  THE

<PAGE>

LAWS OF THE STATE OF NEW YORK,  EXCLUDING  CONFLICT OF LAW PRINCIPLES THAT WOULD
CAUSE THE APPLICATION OF LAWS OF ANY OTHER JURISDICTION.

          SECTION 2.3 Effective Date. This Agreement shall become effective (the
"Effective Date") as of the date first referenced above.

          SECTION 2.4 Effect of Amendment.  From and after the  Effective  Date,
the Note and all references to the Note pursuant to the Note Purchase  Agreement
and the other documents  referenced  therein shall be deemed to be references to
the Note as modified  hereby.  This  Agreement is limited as specified and shall
not  constitute a  modification,  amendment,  acceptance  or waiver of any other
provision  of the  Note,  the Note  Purchase  Agreement  or any  other  document
referenced therein.

          SECTION 2.5 Headings. The article,  section and subsection headings in
this Agreement are for convenience  only and shall not constitute a part of this
Agreement  for any other  purpose and shall not be deemed to limit or affect any
of the provisions hereof.

          SECTION  2.6  Further  Assurances.  From  and  after  the date of this
Agreement,  upon the request of any party  hereto,  each party shall execute and
deliver such  instruments,  documents  and other  writings as may be  reasonably
necessary  or  desirable  to confirm and carry out and to  effectuate  fully the
intent and purposes of this Agreement.

                                    * * * * *

<PAGE>

          IN  WITNESSES  WHEREOF,  the parties  hereto  have  caused  their duly
authorized  officers to execute and deliver this  Agreement as of the date first
above written.

                                     BORROWER:

                                     eMAGIN CORPORATION

                                     By:
                                        --------------------------------------
                                        Name:
                                        Title:

                                     LENDER:

                                     THE TRAVELERS INSURANCE COMPANY

                                     By:
                                        --------------------------------------
                                        Name:
                                        Title:<PAGE>

                                                                     Exhibit 4.1

         AMENDMENT ("Amendment") dated as of June 14, 2002 between FIBERNET
TELECOM GROUP, INC. ("Company") and SDS MERCHANT FUND, L.P. ("SDS") to that
certain Promissory Note dated as of March 14, 2002 (the "Note") by and between
the Company and SDS.

         WHEREAS, pursuant to Section 10 of the Note, the Company and SDS may
amend the Note; and

         WHEREAS, the Company and SDS wish to amend the Note.

         NOW, THEREFORE, the parties agree as follows:

         Section 1. Definitions. Capitalized terms used and not otherwise
defined herein shall have the meanings ascribed to such terms in the Note.

         Section 2. Agreement to Amend. Pursuant to Section 10 of the Note, the
Company and SDS hereby agree to amend the Note as provided herein.

         Section 3.  Amendment.

                  (a) Section 1(a)(i) is hereby amended and restated in its
entirety to read as follows:

                  "June 28, 2002, unless SDS receives written confirmation (in
         form of an officer's certificate) from the Company that the Company has
         received equity commitments in an amount of not less than $9,750,000
         and such written confirmation is in form and substance satisfactory to
         Deutsche Bank AG New York Branch, as administrative agent to the
         Company's Amended and Restated Credit Agreement dated as of February 9,
         2001 in its sole discretion, in which case July 12, 2002;"

                  (b) Section 4(c) is hereby amended and restated in its
entirety to read as follows:

                  "the Proposed Financing shall fail to have been consummated by
         July 12, 2002; or"

         Section 4. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of New York, without giving
effect to the choice of law provisions.

         Section 5. Successors and Assigns. This Amendment shall bind and inure
to the benefit of the parties and their respective successors and assigns,
transferees, legal representatives and heirs.

         Section 6. Headings. The headings of this Amendment have been inserted
for convenience of reference only and shall not be deemed to be a part of this
Amendment.

<PAGE>

         Section 7. Entire Agreement. This Amendment and the other writings
referred to herein or delivered pursuant hereto contain the entire agreement
among the parties hereto with respect to the subject matter hereof and supersede
all prior and contemporaneous agreements and understandings with respect
thereto.

         Section 8. Counterparts. This Amendment may be executed in any number
of counterparts, and each such counterpart shall be deemed to be an original
instrument, but all such counterparts together shall constitute but one
agreement.

                                   * * * * *

<PAGE>

         IN WITNESS WHEREOF, the parties have executed this Amendment as of the
date first written above.

                                FIBERNET TELECOM GROUP, INC.

                                By: /s/ Michael S. Liss
                                    --------------------------------------------
                                    Name:  Michael S. Liss
                                    Title: President and Chief Executive Officer

                                SDS MERCHANT FUND, L.P.

                                By:  SDS Capital Partners, LLC
                                Its: General Partner

                                By: /s/ Steve Derby
                                    --------------------------------------------
                                    Name:  Steve Derby
                                    Title: Managing Partner<PAGE>

                                                                     EXHIBIT 4.1

                     AMENDMENT NO. 1 TO THE RIGHTS AGREEMENT

     Amendment No. 1 to the Rights Agreement, dated as of June 15, 2002, by and
between Zimmer Holdings, Inc. (the "Company") and Mellon Investor Services LLC
(the "Rights Agent").

     WHEREAS, the Company and the Rights Agent have entered into that certain
Rights Agreement, dated as of July 30, 2001 (the "Rights Agreement"); and

     WHEREAS, on June 15, 2002, the Company, by resolution adopted by its Board
of Directors, determined to amend the Rights Agreement.

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
set forth herein, the parties hereto do hereby agree as follows:

1.   The Rights Agreement is hereby amended as follows:

     (a)  The definition of "Acquiring Person" in Section 1 of the Rights
Agreement is hereby amended and restated in its entirety as follows:

          "'ACQUIRING PERSON' shall mean any Person who or which, alone or
          together with all Affiliates and Associates of such Person, shall be
          the Beneficial Owner of more than 20% of the Common Shares then
          outstanding, but shall not include (a)(i) the Company, any Subsidiary
          of the Company, any employee benefit or compensation plan of the
          Company or of any of its Subsidiaries or any Person holding Common
          Shares for or pursuant to the terms of any such employee benefit or
          compensation plan or for the purpose of funding other employee
          benefits for employees of the Company or of any Subsidiary of the
          Company and (ii) until immediately after the distribution of the
          Common Shares of the Company by the sole stockholder of the Company,
          Bristol-Myers Squibb Company ("BRISTOL-MYERS SQUIBB"), to the
          stockholders of Bristol-Myers Squibb, Bristol-Myers Squibb or any
          Affiliate or Associate thereof (each Person covered by clauses (a)(i)
          and (a)(ii), an "EXEMPT PERSON"), or (b) any such Person that the
          Board of Directors of the Company determines has become the Beneficial
          Owner of more than 20% of the Common Shares at the time outstanding
          solely as the result of (i) a change in the aggregate number of Common
          Shares outstanding since the last date on which such Person acquired
          Beneficial Ownership of any Common Shares (PROVIDED, HOWEVER, that if
          a Person becomes the Beneficial Owner of more than 20% of the Common
          Shares then outstanding by reason of such change in the aggregate
          number of Common Shares outstanding and thereafter becomes the
          Beneficial Owner of any additional Common Shares (other than pursuant
          to a dividend or distribution paid or made

                                       1
<PAGE>

          by the Company on the outstanding 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 such Person does not
          beneficially own more than 20% of the shares of Common Shares then
          outstanding), (ii) the acquisition by such Person or one or more of
          its Affiliates or Associates of Beneficial Ownership of additional
          Common Shares if such acquisition was made in the good faith belief
          that such acquisition would not (A) cause the Beneficial Ownership by
          such Person, together with its Affiliates and Associates, to exceed
          20% of the Common Shares outstanding at the time of such acquisition
          and such good faith belief was based on the good faith reliance on
          information contained in publicly filed reports or documents of the
          Company that are inaccurate or out-of-date or (B) otherwise cause a
          Distribution Date or the adjustment provided for in Section 11(a) to
          occur, or (iii) the acquisition by such Person or one or more of its
          Affiliates or Associates of Beneficial Ownership of additional Common
          Shares if the Board of Directors of the Company determines that such
          acquisition was made in good faith without the knowledge by such
          Person or one or more of its Affiliates or Associates that such Person
          would thereby become an Acquiring Person and without the intention of
          changing or influencing control of the Company (including, without
          limitation, because (A) such Person was unaware that it beneficially
          owned a percentage of Common Shares that would otherwise cause such
          Person to be an Acquiring Person or (B) such Person was aware of the
          extent of its Beneficial Ownership of Common Shares but had no actual
          knowledge of the consequences of such Beneficial Ownership under this
          Rights Agreement), which determination of the Board of Directors of
          the Company shall be conclusive and binding on such Person, the Rights
          Agent, the holders of the Rights and all other Persons.
          Notwithstanding clause (b)(ii) or (b)(iii) of the prior sentence, if
          any Person that is not an Acquiring Person due to such clause (b)(ii)
          or (b)(iii) does not reduce its percentage of Beneficial Ownership of
          Common Shares to 20% or less by the Close of Business on the tenth
          calendar day, or such other calendar day as determined, in good faith,
          by the Board of Directors of the Company, after notice from the
          Company (the date of notice being the first day) that such Person's
          Beneficial Ownership of Common Shares would make it an Acquiring
          Person, such Person shall, at the end of the later of (x) such ten
          calendar day period and (y) such other calendar day as determined by
          the Board of Directors of the Company, become an Acquiring Person (and
          such clause (b)(ii) or (b)(iii) shall no longer apply to such Person).
          For purposes of this definition, the determination whether any Person
          acted in "good faith" shall be conclusively determined by the Board of
          Directors of the Company."

     (b)  All references to "15%" in Section 3(b) or any other section of the
Rights Agreement relating to the Beneficial Ownership of the Common Shares shall
be deemed to be references to "20%."

2.   The Rights Agreement shall not otherwise be supplemented or amended by
virtue of this Amendment No. 1 to the Rights Agreement, but shall remain in full
force and effect.

                                       2
<PAGE>

3.   Capitalized terms used without other definition in this Amendment No. 1 to
the Rights Agreement shall be used as defined in the Rights Agreement.

4.   This Amendment No. 1 to the Rights Agreement shall be deemed to be a
contract made under the laws of the State of Delaware and for all purposes shall
be governed by and construed in accordance with the laws of such State
applicable to contracts to be made and performed entirely within such State;
provided, however, that all provisions regarding the rights, duties and
obligations of the Rights Agent shall be governed by and construed in accordance
with the laws of the State of New York applicable to contracts made and to be
performed entirely within such State.

5.   This Amendment No. 1 to the Rights Agreement may be executed in any number
of counterparts and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

6.   All references to the Rights Agreement shall, from and after the execution
of this Amendment No. 1 to the Rights Agreement, be deemed to be references to
the Rights Agreement as amended hereby.

7.   Exhibits B and C to the Rights Agreement shall be deemed amended in a
manner consistent with this Amendment No. 1 to the Rights Agreement.

     IN WITNESS WHEREOF, the parties have executed this Amendment No. 1 to the
Rights Agreement as of the date written above.

                                      ZIMMER HOLDINGS, INC.

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

                                      MELLON INVESTOR SERVICES LLC

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

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