Document:

AMENDMENT TO CONVERTIBLE PROMISSORY NOTE

          AMENDMENT TO SECURED  CONVERTIBLE  PROMISSORY NOTE (this "Agreement"),
dated as of August 30,  2002,  by and  between  eMAGIN  CORPORATION,  a Delaware
corporation (the "Borrower") and Jack Rivkin (the "Lender"), each a party to the
Secured Note Purchase Agreement (the "Note Purchase  Agreement") entered into as
of November  27, 2001 and a Secured  Convertible  Promissory  Note (the  "Note")
dated  November 27, 2001.  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 parties wish to amend the Note to extend its maturity date;

     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  "August  30,  2002"  and  inserting  in the place of such
deletion "September 30, 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 laws of the State of New York,
excluding conflict of law principles that would cause the application of laws of
any other jurisdiction.

          SECTION 3.3 Effective Date. This Agreement shall become effective (the
"Effective Date") as of the date first referenced above.

          SECTION 3.4 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.
<PAGE>

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 or herein.

          SECTION 3.5 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  3.6  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:

                                     Jack Rivkin

                                     -------------------------------------------<PAGE>

                                                                    EXHIBIT 4(d)

                          FIFTH SUPPLEMENTAL INDENTURE

     This Fifth Supplemental Indenture, dated as of August 31, 2002 (this
"Supplemental Indenture"), among CenterPoint Energy, Inc., a Texas corporation
("CEP"), Reliant Energy, Incorporated, a Texas corporation (formerly Houston
Lighting & Power Company) (the "Company"), and JPMorgan Chase Bank (formerly
Texas Commerce Bank National Association), as Trustee (the "Trustee"),
supplements the Collateral Trust Indenture dated as of September 1, 1988 (the
"Indenture") between the Company and the Trustee, as supplemented by the First
Supplemental Indenture dated as of January 1, 1989 between the Company and the
Trustee, the Second Supplemental Indenture dated as of May 1, 1989 between the
Company and the Trustee, the Third Supplemental Indenture dated as of February
1, 1993 between the Company and the Trustee and the Fourth Supplemental
Indenture dated as of December 1, 1993 between the Company and the Trustee under
which the Company's Series A, B and C Medium Term Notes were issued and Series C
Medium Term Notes (the "Securities") remain outstanding.

                                    RECITALS

     WHEREAS, pursuant to an Agreement and Plan of Merger dated as of October
19, 2001, among the Company, CEP and Reliant Energy MergerCo, Inc., a Texas
corporation and an indirect wholly-owned subsidiary of CEP ("MergerCo"),
MergerCo will be merged with and into the Company (the "Merger"), with the
Company to be the surviving corporation, as a result of which, at the effective
time of the Merger, each share of common stock, without par value, of the
Company will be converted into one share of CEP common stock and the Company
will become a wholly-owned subsidiary of CEP;

     WHEREAS, concurrently with the Merger, the Company will (i) distribute the
capital stock of all of its subsidiaries, other than certain financing
subsidiaries, to CEP (the "Stock Distribution") and (ii) convey its Texas
electric generation assets and certain buildings and related assets to indirect
wholly owned subsidiaries of CEP (the "Asset Conveyance," and together with the
Merger and the Stock Distribution, the "Restructuring");

     WHEREAS, the Restructuring is a transfer of the Company's properties and
assets substantially as an entirety;

     WHEREAS, pursuant to Section 901 of the Indenture, CEP, as the transferee
of the Company's properties and assets substantially as an entirety, is required
to expressly assume, by an indenture supplemental to the Indenture, the due and
punctual payment of the principal of (and premium, if any) and interest
(including all additional amounts, if any, payable pursuant to the Indenture) on
all the Securities and the performance of every covenant of the Indenture on the
part of the Company to be performed or observed;

     WHEREAS, Section 1001 of the Indenture provides that under certain
conditions the Company and the Trustee, without the consent of the Holders of
Securities, at any time and from time to time, may enter into an indenture
supplemental to the Indenture for the purposes

<PAGE>

inter alia, to evidence the succession of another corporation to the Company and
the assumption by any such successor of the covenants of the Company under the
Indenture and in the Securities;

                   NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE
                                   WITNESSETH:

     In consideration of the premises and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, and to comply with
Sections 901 and 1001 of the Indenture, the parties hereto hereby agree, for the
equal and proportionate benefit of the respective Holders from time to time of
the Securities, as follows:

     Section 1. Defined Terms. Capitalized terms used and not otherwise defined
herein shall have the respective meanings assigned to such terms in the
Indenture.

     Section 2. Succession by Transfer of Properties and Assets Substantially as
an Entirety.

     (1) Upon consummation of the Restructuring, CEP shall become the successor
to the Company for all purposes of the Indenture and CEP hereby expressly
assumes the due and punctual payment of the principal of (and premium, if any)
and interest (including all additional amounts, if any, payable pursuant to the
Indenture) on all the Securities and the performance of every covenant of the
Indenture, as supplemented by this Supplemental Indenture, on the part of the
Company to be performed or observed.

     (2) Concurrently with the execution and delivery of this Supplemental
Indenture, the Company has delivered to the Trustee an Officers' Certificate and
an Opinion of Counsel as required by Section 901(3) of the Indenture.

     (3) Pursuant to Section 902 of the Indenture, concurrently with the
execution and delivery of this Supplemental Indenture, (i) CEP shall succeed to,
and be substituted for, and may exercise every right and power of, the Company
under the Indenture with the same effect as if CEP had been named as the Company
in the Indenture and (ii) the Company shall be relieved of all obligations and
covenants under the Indenture and the Securities.

     Section 3. Ratification. The Indenture as hereby supplemented is in all
respects ratified and confirmed by each of the parties hereto, and all of the
rights and powers created thereby or thereunder shall be and remain in full
force and effect.

     Section 4. Governing Law. The laws of the State of Texas shall govern this
Supplemental Indenture without regard to principles of conflicts of laws.

     Section 5. Successors. All agreements of the parties hereto in this
Supplemental Indenture shall bind their respective successors.

     Section 6. Multiple Counterparts. The parties hereto may sign multiple
counterparts of this Supplemental Indenture. Each signed counterpart shall be
deemed an original, but all of them together represent the same agreement.

                                       2

<PAGE>

     Section 7. Trustee's Disclaimer. The recitals contained herein shall be
taken as the statements of the Company and CEP, and the Trustee assumes no
responsibility for their correctness. The Trustee makes no representations as to
the validity or sufficiency of this Supplemental Indenture.

                                       3

<PAGE>

     IN WITNESS WHEREOF, the undersigned have caused this Supplemental Indenture
to be executed by its duly authorized officer as of the date first above
written.

                                       CENTERPOINT ENERGY, INC.

                                       By:         /s/ Rufus Scott
                                          --------------------------------------
Attest:                                   Name: Rufus Scott
                                          Title: Vice President

By:      /s/ Richard B. Dauphin
   ----------------------------------
   Name: Richard B. Dauphin
   Title: Assistant Corporate
          Secretary

                                       RELIANT ENERGY, INCORPORATED

                                       By:        /s/ Marc Kilbride
                                          --------------------------------------
Attest:                                   Name: Marc Kilbride
                                          Title: Treasurer

By:      /s/ Richard B. Dauphin
   ----------------------------------
   Name: Richard B. Dauphin
   Title: Assistant Corporate
          Secretary

                                       JPMORGAN CHASE BANK,
                                       Trustee

                                       By:          /s/ Bill Marshall
                                          --------------------------------------
                                          Name: Bill Marshall
                                          Title: Vice President

                                       4

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