Document:

<PAGE>

                                                            Executed in 6 Parts
                                                           Counterpart No. (   )

                              NATIONAL EQUITY TRUST

                           LOW FIVE PORTFOLIO SERIES 43

                            REFERENCE TRUST AGREEMENT

         This Reference Trust Agreement dated January 9, 2002 among Prudential
Investment Management Services LLC, as Depositor, Prudential Securities
Incorporated, as Portfolio Supervisor, and The Bank of New York, as Trustee,
sets forth certain provisions in full and incorporates other provisions by
reference to the document entitled "National Equity Trust, Trust Indenture and
Agreement" (the "Basic Agreement") dated February 2, 2000. Such provisions as
are set forth in full herein and such provisions as are incorporated by
reference constitute a single instrument (the "Indenture").

                                WITNESSETH THAT:

         In consideration of the premises and of the mutual agreements herein
contained, the Depositor and the Trustee agree as follows:

                                     Part I.

                     STANDARD TERMS AND CONDITIONS OF TRUST

         Subject to the provisions of Part II hereof, all the provisions
contained in the Basic Agreement are herein incorporated by reference in their
entirety and shall be deemed to be a part of this instrument as fully and to the
same extent as though said provisions had been set forth in full in this
instrument.

         A. Article I, entitled "Definitions," shall be amended as follows:

         (i) Section 1.01-Definitions shall be amended to add the following
definition at the end thereof:

<PAGE>

                                      -2-

         "Portfolio Supervisor" of the Trust shall have the meaning assigned to
it in Part II of the Reference Trust Agreement.

         B. Article III, entitled "Administration of Trust," shall be amended as
follows:

         (i) The third paragraph of Section 3.05-Distribution shall be amended
by deleting any reference to Depositor and replacing it with Portfolio
Supervisor.

         (ii) Section 3.14-Deferred Sales Charge shall be amended to add the
following sentences at the end thereof:

         "References to Deferred Sales Charge in this Trust Indenture and
         Agreement shall include any Creation and Development Fee indicated in
         the prospectus for a Trust. The Creation and Development Fee shall be
         payable on each date so designated and in an amount determined as
         specified in the prospectus for a Trust."

         C. Article VIII, entitled "Depositor," shall be amended as follows:

         (i) Section 8.07-Compensation shall be amended by deleting any
reference to Depositor and replacing it with Portfolio Supervisor.

          D. Article IX, entitled "Additional Covenants; Miscellaneous
Provisions," shall be amended as follows:

          (i) The first sentence of Section 9.05 - Written Notice shall be
amended by deleting the language "Prudential Securities Incorporated at One
Seaport Plaza, New York, New York 10292" and replacing it with "Prudential
Investment Management LLC at 100 Mulberry Street, Gateway Center Three, Newark,
New Jersey 07102".

                                    Part II.

                      SPECIAL TERMS AND CONDITIONS OF TRUST

         The following special terms and conditions are hereby agreed to:

<PAGE>

                                      -3-

                  A. The Trust is denominated National Equity Trust, Low Five
         Portfolio Series 43.

                  B. The Units of the Trust shall be subject to a deferred sales
         charge.

                  C. The publicly traded stocks listed in Schedule A hereto are
         those which, subject to the terms of this Indenture, have been or are
         to be deposited in Trust under this Indenture as of the date hereof.

                  D. The term "Depositor" shall mean Prudential Investment
         Management Services LLC.

                  E. The term "Portfolio Supervisor" shall mean Prudential
         Securities Incorporated.

                  F. The aggregate number of Units referred to in Sections 2.03
         and 9.01 of the Basic Agreement is 125,000 as of the date hereof.

                  G. A Unit of the Trust is hereby declared initially equal to
         1/125,000th of the Trust.

                  H. The term "First Settlement Date" shall mean
         January 15, 2002.

                  I. The terms "Computation Day" and "Record Date" shall mean on
         the tenth day of April 2002, July 2002, October 2002 and January 2003.

                  J. The term "Distribution Date" shall mean on the twenty-fifth
         day of April 2002, July 2002, October 2002 and January 2003.

                  K. The term "Termination Date" shall mean February 12, 2003.

                  L. The Trustee's Annual Fee shall be $.90 (per 1,000 Units)
         for 49,999,999 and below units outstanding $.84 (per 1,000 Units) on
         the next 50,000,000 Units, $.78 (per 1,000 Units) on the next
         100,000,000 Units, and $.66 (per 1,000 Units) on Units in excess of
         200,000,000 Units. In calculating the Trustee's annual fee, the fee
         applicable to the number of units outstanding shall apply to all units
         outstanding.

                  M. The Portfolio Supervisor's portfolio supervisory service
         fee shall be $.25 per 1,000 Units.

               [Signatures and acknowledgments on separate pages]

<PAGE>

                                      -4-

         The Schedule of Portfolio Securities in Part A of the prospectus
         included in this Registration Statement for National Equity Trust, Low
         Five Portfolio Series 43 is hereby incorporated by reference herein as
         Schedule A hereto.<PAGE>

                                                                  EXHIBIT 4.(b)

                                                            Executed in 6 Parts
                                                           Counterpart No. (   )

                              NATIONAL EQUITY TRUST

                           OTC GROWTH TRUST SERIES 18

                            REFERENCE TRUST AGREEMENT

     This Reference Trust Agreement dated January 9, 2002 among Prudential
Investment Management Services LLC, as Depositor, Prudential Securities
Incorporated, as Portfolio Supervisor, and The Bank of New York, as Trustee,
sets forth certain provisions in full and incorporates other provisions by
reference to the document entitled "National Equity Trust, Trust Indenture and
Agreement" (the "Basic Agreement") dated February 2, 2000. Such provisions as
are set forth in full herein and such provisions as are incorporated by
reference constitute a single instrument (the "Indenture").

                                WITNESSETH THAT:

     In consideration of the premises and of the mutual agreements herein
contained, the Depositor and the Trustee agree as follows:

                                     Part I.

                     STANDARD TERMS AND CONDITIONS OF TRUST

     Subject to the provisions of Part II hereof, all the provisions contained
in the Basic Agreement are herein incorporated by reference in their entirety
and shall be deemed to be a part of this instrument as fully and to the same
extent as though said provisions had been set forth in full in this instrument.

     A. Article I, entitled "Definitions," shall be amended as follows:

     (i) Section 1.01-Definitions shall be amended to add the following
definition at the end thereof:

<PAGE>

                                      -2-

     "Portfolio Supervisor" of the Trust shall have the meaning assigned to it
in Part II of the Reference Trust Agreement.

     B. Article III, entitled "Administration of Trust," shall be amended as
follows:

     (i) The third paragraph of Section 3.05-Distribution shall be amended by
deleting any reference to Depositor and replacing it with Portfolio Supervisor.

     (ii) Section 3.14-Deferred Sales Charge shall be amended to add the
following sentences at the end thereof:

     "References to Deferred Sales Charge in this Trust Indenture and Agreement
     shall include any Creation and Development Fee indicated in the prospectus
     for a Trust. The Creation and Development Fee shall be payable on each date
     so designated and in an amount determined as specified in the prospectus
     for a Trust."

     C. Article VIII, entitled "Depositor," shall be amended as follows:

     (i) Section 8.07-Compensation shall be amended by deleting any reference to
Depositor and replacing it with Portfolio Supervisor.

     D. Article IX, entitled "Additional Covenants; Miscellaneous Provisions,"
shall be amended as follows:

     (i) The first sentence of Section 9.05 - Written Notice shall be amended by
deleting the language "Prudential Securities Incorporated at One Seaport Plaza,
New York, New York 10292" and replacing it with "Prudential Investment
Management LLC at 100 Mulberry Street, Gateway Center Three, Newark, New Jersey
07102."

                                    Part II.

                      SPECIAL TERMS AND CONDITIONS OF TRUST

     The following special terms and conditions are hereby agreed to:

<PAGE>

                                      -3-

     A. The Trust is denominated National Equity Trust, OTC Growth Trust Series
18.

     B. The Units of the Trust shall be subject to a deferred sales charge.

     C. The publicly traded stocks listed in Schedule A hereto are those which,
subject to the terms of this Indenture, have been or are to be deposited in
Trust under this Indenture as of the date hereof.

     D. The term "Depositor" shall mean Prudential Investment Management
Services LLC.

     E. The term "Portfolio Supervisor" shall mean Prudential Securities
Incorporated.

     F. The aggregate number of Units referred to in Sections 2.03 and 9.01 of
the Basic Agreement is 125,000 as of the date hereof.

     G. A Unit of the Trust is hereby declared initially equal to 1/125,000th of
the Trust.

     H. The term "First Settlement Date" shall mean January 15, 2002.

     I. The terms "Computation Day" and "Record Date" shall be on such dates as
the Sponsor shall direct.

     J. The term "Distribution Date" shall be on such dates as the Sponsor shall
direct.

     K. The term "Termination Date" shall mean February 12, 2003.

     L. The Trustee's Annual Fee shall be $.90 (per 1,000 Units) for 49,999,999
and below units outstanding $.84 (per 1,000 Units) on the next 50,000,000 Units,
$.78 (per 1,000 Units) on the next 100,000,000 Units, and $.66 (per 1,000 Units)
on Units in excess of 200,000,000 Units. In calculating the Trustee's annual
fee, the fee applicable to the number of units outstanding shall apply to all
units outstanding.

     M. The Portfolio Supervisor's portfolio supervisory service fee shall be
$.25 per 1,000 Units.

               [Signatures and acknowledgments on separate pages]

<PAGE>

                                      -4-

     The Schedule of Portfolio Securities in Part A of the prospectus included
     in this Registration Statement for National Equity Trust, OTC Growth Trust
     Series 18 is hereby incorporated by reference herein as Schedule A hereto.

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