Document:

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                                                                    Exhibit 10.2

                         DATED                     2001

                                     TOM LAM

                                       AND

                           WARMINSTER SYSTEMS LIMITED

                        AGREEMENT FOR SOFTWARE ASSIGNMENT

                                    FOX HAYES
<PAGE>   2
                        AGREEMENT FOR SOFTWARE ASSIGNMENT

This agreement is made the day of 9th day of April 2001

BETWEEN:

the Assignor  Tom Lam
              107 The Butts Frome Somerset

the Assignee  Warminster Systems Limited
              9 Sandown Road White Horse Business Park Trowbridge Wiltshire

RECITAL

The Assignor is the registered proprietor of the Licensed Materials and has
agreed to assign it to the Assignee on the following terms and conditions.

IT IS AGREED as follows:

1.       DEFINITIONS

In this Agreement unless inconsistent with the context or otherwise specified
the following definitions will apply:

1.1      "Agreement" means this assignment, terms and schedules to it.

1.2      "Documentation" means the operating manuals, user instructions and
         other related materials (whether physically or by electronic means) for
         aiding the use of the Licensed Materials including any part or copy of
         them.

1.3      "Licensed Materials" means the matters referred to in schedule 1.

2.       AGREEMENT TO ASSIGN

2.1      Assignment
         The Assignor assigns to the Assignee sole and exclusive rights in the
         world to the Licensed Materials from the date of this agreement. The
         use of the Licensed Materials is subject to the Assignee being
         responsible at its own expense for complying with all applicable export
         and import laws and regulations.

3.       PERMITTED USE

3.1      The Assignee may use the Licensed Materials for all purposes.

3.2      The Assignee may translate or adapt the Licensed Materials for any
         purpose or create derivative works based on the Licensed Materials
         without any further consent of the Assignor.

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3.3      The Assignee may transfer or distribute (whether by license, loan,
         rental, sale or otherwise) all or any part of the Licensed Materials to
         any other person.

3.4      The Assignee may make for any purpose including (without limitation)
         for error correction, any alterations, modifications, additions or
         enhancements to the Licensed Materials and may permit the whole or any
         part of the Licensed Materials to be combined with or become
         incorporated in any other program without the Assignor's prior consent.

3.5      The Assignee may, or permit others to, decompile, reverse-engineer or
         disassemble the Licensed Materials or any part.

3.6      A separate assignment is not required for the use of copies of the
         Licensed Materials.

4.       EXTENT OF PERMITTED REPRODUCTION

4.1      The Assignee is permitted to make copies of the Licensed Materials for
         all purposes. Any such copies will be the property of the Assignee.

4.2      The Assignee may make or permit others to make copies of the Licensed
         Materials without the Assignor's prior written consent.

5.       PROPERTY RIGHTS

5.1      The Assignee will acquire all title copyright and any other property
         rights in the Licensed Materials.

5.2      The Assignee may remove, suppress or modify in any way any proprietary
         marking, including any trade mark or copyright notice, on or in the
         Licensed Materials.

5.3      The Assignee is not required to notify the Assignor if the Assignee
         becomes aware of any unauthorized access to, use or copying of any part
         of the Licensed Materials by any person.

5.4      The Assignee is not required to permit the Assignor to check the use of
         the Licensed Materials by the Assignee.

6.       ASSIGNOR'S WARRANTIES AND INDEMNITY

The Assignor warrants that:

6.1      the Assignor is the sole proprietor of the Licensed Materials and has
         full power to enter into this Agreement.

6.2      the Assignor has not granted any licenses to use the Licensed Materials
         nor suffered it to be the subject of any charge mortgage or other
         encumbrance.

6.3      the Assignor will keep the Assignee fully indemnified against all
         actions claims proceedings costs and damages (including any damages or
         compensation paid by the

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         Assignee on the advice of its legal advisers to compromise or settle
         any claim) and all legal costs or other expenses arising out of any
         breach of the above warranties or out of any claim by a third party
         based on any facts which if substantiated would constitute such a
         breach.

6.4

6.4.1    the Licensed Materials when properly used on the Equipment will provide
         the facilities and functions as described.

6.4.2    the Assignor warrants that the operation of the Licensed Materials will
         be uninterrupted and error-free.

7.       COPYRIGHT INDEMNITY

7.1      The Assignor will indemnify the Assignee for its reasonable costs and
         all damages awarded under any final judgment by a court of competent
         jurisdiction or agreed by the Assignor in final settlement to the
         extent that the Licensed Materials used in accordance with the License
         infringes the copyright, trademarks, intellectual property rights or
         trade secrets or any third party.

Provided that

7.1.1    the Assignee makes no statement prejudicial to the Assignor;

7.1.2    such infringement is not caused by or contributed to by acts of the
         Assignee;

7.1.3    the Assignor is promptly notified in writing of the details of the
         claim;

7.1.4    the Assignor has sole control of the defense of such claim and all
         related settlement negotiations; and

7.1.5    the Assignee gives the Assignor all reasonable assistance at the
         Assignor's expense in connection therewith.

7.2      If at any time an allegation of infringement of any third party rights
         is made, or in the Assignor's opinion is likely to be made, in respect
         of the Licensed Materials the Assignor may at its own expense modify or
         replace the Licensed Materials so as to avoid infringement.

7.3      The Assignor will have no liability for any infringement claim based
         on:

7.3.1    use of other that the latest unaltered current release of the Licensed
         Materials; or

7.3.2    use or combination of the Licensed Materials with equipment , programs
         or data not supplied by the Assignor; or

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7.3.3    the Assignee's refusal to use modified or replacement Licensed
         Materials supplied or offered to be supplied pursuant to clause 7.2.

7.4      This clause states the entire liability of the Assignor with respect to
         the infringement or alleged infringement of any third party rights of
         any kind whatever by the Licensed Materials.

8.       ASSIGNMENT

The Assignee may assign or otherwise transfer its rights or obligations under
this Agreement without the prior written consent of the Assignor.

AS WITNESS of which this agreement has been signed the day and year first above
written.

SIGNED by                         )
                                  )
    s/  Tom Lam                   )
----------------------------------
duly authorized for the Assignor  )

SIGNED by                         )
                                  )
    s/  Anthony Power             )
----------------------------------
duly authorized for the Assignee  )

                                      -5-
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                                   SCHEDULE I

                         (Licensed Materials clause 1.3)

Proprietary software namely TIM, MAPCOM and NEWCOMMS used exclusively by the
assignee in the systems detailed in its prospectus namely Blue Box, Trackcomp,
FM Series-Fuel Monitor Systems, Data Acquisition Units - Vehicle Data
Management, Software-Fleet Management Systems.

                                      -6-<PAGE>   1
                                                                     EXHIBIT 4.1

                                                                          [FORM]

                                   CONOCO INC.

                    Floating Rate Notes due October 15, 2002
                     Floating Rate Notes due April 15, 2003

         Two series of Securities are hereby established pursuant to Section
2.01 of the Indenture dated as of April 15, 1999 (the "Indenture") between
Conoco Inc. (the "Company") and Bank One, N.A., as trustee (the "Trustee"), as
follows:

         1. Each capitalized term used but not defined herein shall have the
meaning assigned to such term in the Indenture.

         2. The title of the Floating Rate Notes due October 15, 2002 shall be
"Floating Rate Notes due October 15, 2002" (the "2002 Notes") and the title of
the Floating Rate Notes due April 15, 2003 shall be "Floating Rate Notes due
April 15, 2003" (the "2003 Notes" and, together with the 2002 Notes, the
"Notes").

         3. The limit upon the aggregate principal amount of the 2002 Notes and
the 2003 Notes that may be authenticated and delivered under the Indenture
(except for Notes of such series authenticated and delivered upon registration
of transfer of, or in exchange for, or in lieu of, other Notes of such series
pursuant to Section 2.08, 2.09, 2.12, 2.17, 3.07 or 9.05 of the Indenture and
except for any Notes of such series which, pursuant to Section 2.04 or 2.17 of
the Indenture, are deemed never to have been authenticated and delivered
thereunder) is $500,000,000 and $500,000,000, respectively; provided, however,
that the authorized aggregate principal amount of each series of the Notes may
be increased before or after the issuance of any Notes of such series by a Board
Resolution (or action pursuant to a Board Resolution) to such effect.

         4. The Notes shall be issued as permanent Global Securities under the
Indenture. The Depository Trust Company and the Trustee are hereby designated as
the Depositary and the Security Custodian, respectively, for the Global
Securities under the Indenture.

         5. The Notes and the Trustee's certificate of authentication shall be
substantially in the form of Annex A hereto (the "Form of Note").

         6. The date on which the principal of the 2002 Notes and the 2003 Notes
is payable shall be October 15, 2002 and April 15, 2003, respectively.

         7. Interest shall be payable in accordance with the provisions of
paragraph 1 of the Notes and shall be calculated in accordance with the
provisions of paragraph 2 of the Notes. No Additional Amounts with respect to
the Notes shall be payable. The date from which interest shall accrue for the
Notes of each series shall be October 11, 2001. The Interest Payment Dates on
which such interest shall be payable shall be January 15, April 15, July 15 and
October 15 of each year, commencing January 15, 2002. The record dates for the
interest payable on the

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Notes on any Interest Payment Date shall be the January 1, April 1, July 1 and
October 1, as the case may be, next preceding such Interest Payment Date.

         8. The place or places where the principal of, premium (if any) on and
interest on the Notes shall be payable shall be the office or agency of the
Company maintained for that purpose, initially the office of the Trustee, in The
City of New York, and any other office or agency maintained by the Company for
such purpose. Payments in respect of Notes evidenced by a Global Security
(including principal, premium, if any, and interest) shall be made by wire
transfer of immediately available funds to the accounts specified by the Holder
of such Notes. In all other cases, at the option of the Company, payment of
interest may be made by check mailed to the address of the person entitled
thereto as such address shall appear in the register of the Notes maintained by
the Registrar.

         9. The Paying Agent, Registrar and Calculation Agent (as defined in the
Form of Note) for the Notes of each series initially shall be the Trustee. In
addition, as long as the Notes of any series are listed on the Luxembourg Stock
Exchange, the Company shall maintain a Paying Agent and Registrar for the Notes
of such series in Luxembourg, which initially shall be Kredietbank S.A.
Luxembourg.

         10. The Notes are not subject to redemption at the option of the
Company, and the Company shall have no obligation to redeem, purchase or repay
Notes pursuant to any sinking fund or analogous provision or at the option of a
Holder thereof.

         11. Each Note that is a Global Security shall bear the legend set forth
on the face of the Form of Note.

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                                                                         Annex A

                               [FACE OF SECURITY]

                                   CONOCO INC.

                    [FLOATING RATE NOTE DUE OCTOBER 15, 2002]
                     [FLOATING RATE NOTE DUE APRIL 15, 2003]

                                                          CUSIP No._____________

No.__________                                                     $_____________

         Conoco Inc., a Delaware corporation (the "Company," which term includes
any successor Person under the Indenture hereinafter referred to), for value
received, promises to pay to ____________ or registered assigns, the principal
sum of ___________________________ Dollars [, or such greater or lesser amount
as indicated on the Schedule of Exchanges of Securities hereto,](1) on [October
15, 2002] [April 15, 2003].

         Interest Payment Dates:   January 15, April 15, July 15 and October 15

         Record Dates:             January 1, April 1, July 1 and October 1

         Reference is hereby made to the further provisions of this Security set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

         IN WITNESS WHEREOF, the Company has caused this Security to be signed
manually or by facsimile by its duly authorized officers and its corporate seal
or a facsimile thereof to be affixed hereto or imprinted hereon.

Dated:

[SEAL]                                 CONOCO INC.

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

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

--------
  (1)     This phrase to be included only if the Security is a Global Security.

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Certificate of Authentication:

This is one of the Securities of the series designated therein referred to in
the within- mentioned Indenture.

BANK ONE, N.A., as Trustee

By:
    --------------------------------------------------------
         Authorized Officer

         [Unless and until it is exchanged in whole or in part for Securities in
definitive form, this Security may not be transferred except as a whole by the
Depositary to a nominee of the Depositary or by a nominee of the Depositary to
the Depositary or another nominee of the Depositary or by the Depositary or any
such nominee to a successor Depositary or a nominee of such successor
Depositary. The Depository Trust Company (55 Water Street, New York, New York),
a New York corporation ("DTC"), shall act as the Depositary until a successor
shall be appointed by the Company and the Registrar. Unless this certificate is
presented by an authorized representative of DTC to the issuer or its agent for
registration of transfer, exchange or payment, and any certificate issued is
registered in the name of Cede & Co. or in such other name as is requested by an
authorized representative of DTC (and any payment is made to Cede & Co. or to
such other entity as is requested by an authorized representative of DTC), ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest
herein.](2)

--------
  (2)   This paragraph to be included only if the Security is a Global Security.

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                              [REVERSE OF SECURITY]

                                   CONOCO INC.

                    [FLOATING RATE NOTE DUE OCTOBER 15, 2002]
                     [FLOATING RATE NOTE DUE APRIL 15, 2003]

         This Security is one of a duly authorized issue of [Floating Rate Notes
due October 15, 2002] [Floating Rate Notes due April 15, 2003] (the
"Securities") of Conoco Inc., a Delaware corporation (the "Company").

         1. Interest. The Company promises to pay interest on the principal
amount of this Security as set forth below from, and including, October 11, 2001
until maturity. The Company will pay interest quarterly on January 15, April 15,
July 15 and October 15 of each year (each an "Interest Payment Date"), or if any
such day is not a Business Day, on the next succeeding Business Day. Interest on
the Securities will accrue from, and including, the most recent Interest Payment
Date on which interest has been paid or, if no interest has been paid, from, and
including, October 11, 2001; provided that if there is no existing Default in
the payment of interest, and if this Security is authenticated between a record
date referred to on the face hereof (each, a "Record Date") and the next
succeeding Interest Payment Date, interest shall accrue from, and including,
such next succeeding Interest Payment Date; provided, further, that the first
Interest Payment Date shall be January 15, 2002. The Company shall pay interest
on overdue principal and premium (if any) from time to time at a rate equal to
the interest rate then in effect; it shall pay interest on overdue installments
of interest (without regard to any applicable grace periods) from time to time
at the same rate to the extent lawful. The period beginning on, and including,
October 11, 2001 and ending on, but excluding, the next Interest Payment Date
thereafter, and each successive three-month period beginning on, and including,
an Interest Payment Date and ending on, but excluding, the next succeeding
Interest Payment Date is herein called an "Interest Period."

         2. Calculation of Interest.

         (a) The rate of interest payable from time to time in respect of the
Securities (the "Rate of Interest") shall be a floating rate subject to
adjustment once for each Interest Period and determined by reference to LIBOR,
determined as described below, plus a spread of [0.77] [0.85]% per annum. All
percentages resulting from any calculation of the Rate of Interest on the
Securities shall be rounded to the nearest one hundred-thousandth of a
percentage point, with five one millionths of a percentage point rounded upwards
(e.g., 9.876545% (or .09876545) would be rounded to 9.87655% (or .0987655)), and
all dollar amounts used in or resulting from such calculation on the Securities
shall be rounded to the nearest cent (with one-half cent being rounded upward).

         The Rate of Interest in effect on each day that is not an Interest
Reset Date (as defined below) shall be the Rate of Interest determined as of the
Interest Determination Date (as defined below) in respect of the next preceding
Interest Reset Date. The Rate of Interest in effect on each day that is an
Interest Reset Date shall be the Rate of Interest determined as of the Interest
Determination Date in respect of such Interest Reset Date.

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         (b) The Calculation Agent shall reset the Rate of Interest on each
Interest Payment Date and on October 11, 2001 (each, an "Interest Reset Date").
At approximately 11:00 a.m., London time, on the second London Business Day (or,
for purposes of the third sentence of paragraph (c) below, the Business Day)
next preceding each Interest Reset Date (each, an "Interest Determination
Date"), Bank One, N.A., or its successor in this capacity (the "Calculation
Agent"), shall calculate the Rate of Interest for the following Interest Period
as, subject to the provisions described below, the rate per annum equal to
[0.77] [0.85]% above the rate for deposits in United States dollars having a
maturity of three months commencing on the first day of such Interest Period
that appears on the Telerate Page (as defined below) on such Interest
Determination Date. "London Business Day" means any day on which dealings in
United States dollars are transacted in the London interbank market.

         (c) If no such rate appears on the Telerate Page as specified in
paragraph (b) above, the Calculation Agent shall request the principal London
offices of each of four major reference banks in the London interbank market, as
selected by the Calculation Agent (after consultation with the Company), to
provide the Calculation Agent with its offered quotation for deposits in United
States dollars for the period of three months, commencing on the first day of
the applicable Interest Period, to prime banks in the London interbank market at
approximately 11:00 a.m., London time, on such Interest Determination Date and
in a principal amount that is representative for a single transaction in United
States dollars in that market at that time. If at least two quotations are
provided, then LIBOR on such Interest Determination Date shall be the arithmetic
mean of such quotations. If fewer than two quotations are provided, then LIBOR
on such Interest Determination Date shall be the arithmetic mean of the rates
quoted at approximately 11:00 a.m., in The City of New York, on the Interest
Determination Date by three major banks in The City of New York selected by the
Calculation Agent (after consultation with the Company) for loans in United
States dollars to leading European banks, having a three-month maturity and in a
principal amount that is representative for a single transaction in United
States dollars in that market at that time. If, however, the banks selected by
the Calculation Agent are not providing quotations in the manner described by
the previous sentence, LIBOR determined as of such Interest Determination Date
shall be LIBOR in effect on such Interest Determination Date.

         "Telerate Page" means the display designated as "Page 3750" on Bridge
Telerate, Inc., or any successor service, for the purpose of displaying the
London interbank rates of major banks for United States dollars.

         (d) The Calculation Agent shall, as soon as practicable after 11:00
a.m. (London time) on each Interest Determination Date, determine the Rate of
Interest and calculate the amount of interest payable in respect of the
following Interest Period (the "Interest Amount"). The Interest Amount shall be
calculated by applying the Rate of Interest to the principal amount of each
Security outstanding at the commencement of the Interest Period, multiplying
each such amount by the actual number of days in the Interest Period concerned
(which actual number of days shall include the first day but exclude the last
day of such Interest Period) divided by 360 and rounding the resultant figure
upwards to the nearest cent (half a cent being rounded upwards). The
determination of the Rate of Interest and the Interest Amount by the Calculation
Agent shall (in the absence of manifest error) be final and binding on all
parties.

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         The Calculation Agent has determined that the Rate of Interest for the
initial Interest Period is [_________] [__________]%.

         (e) Notwithstanding anything herein to the contrary, the Rate of
Interest shall in no event be higher than the maximum rate permitted by New York
law, as the same may be modified by United States law of general application.

         (f) Interest shall cease to accrue on this Security on the maturity
date unless, upon presentation of this Security, payment of principal is
improperly withheld or refused, in which case, interest shall continue to
accrue.

         3. Calculation Agent. So long as any of the Securities remain
outstanding, the Company shall maintain under appointment a Calculation Agent,
which shall initially be the Trustee, for the purpose of the Securities. If the
Trustee shall be unable or unwilling to continue to act as Calculation Agent or
if the Calculation Agent fails to calculate properly the Rate of Interest for
any Interest Period, the Company shall appoint another leading commercial or
investment bank engaged in the London interbank market to act as the Calculation
Agent. The Company may change the Calculation Agent without notice. The
Calculation Agent may not resign in its duties, and the Company may not change
the Calculation Agent, without a successor Calculation Agent having been
appointed that meets the requirements of this paragraph.

         All certificates, communications, opinions, determinations,
calculations, quotations and decisions given, expressed, made or obtained for
the purposes of the provisions hereof relating to the payment and calculation of
interest on the Securities, whether by the reference banks referred to in
paragraph 2(c) above (or any of them) or the Calculation Agent, shall (in the
absence of manifest error) be binding on the Company, the Calculation Agent and
all of the holders and owners of beneficial interests in this Securities, and no
liability shall (in the absence of manifest error) attach to the Calculation
Agent in connection with the exercise or non-exercise by it of its powers,
duties and discretions.

         4. Method of Payment. The Company will pay interest on the Securities
(except defaulted interest) to the Persons who are registered Holders of
Securities at the close of business on the Record Date next preceding the
Interest Payment Date, even if such Securities are canceled after such Record
Date and on or before such Interest Payment Date. The Holder must surrender this
Security to a Paying Agent to collect principal payments. The Company will pay
the principal of, premium (if any) on and interest on the Securities in money of
the United States of America that at the time of payment is legal tender for
payment of public and private debts. Such amounts shall be payable at the
offices of the Trustee (as defined below), provided that at the option of the
Company, the Company may pay such amounts (1) by wire transfer with respect to
Global Securities or (2) by check payable in such money mailed to a Holder's
registered address with respect to any Securities.

         5. Paying Agent and Registrar. Initially, Bank One, N.A. (the
"Trustee"), the trustee under the Indenture, will act as Paying Agent and
Registrar. In addition, as long as the Securities are listed on the Luxembourg
Stock Exchange, the Company shall maintain a Paying Agent and Registrar for the
Securities in Luxembourg, which initially shall be Kredietbank S.A. Luxembourg.
The Company may change any Paying Agent, Registrar, co-

                                      AA-5
<PAGE>   8

registrar or additional paying agent without notice to any Holder. The Company
or any Subsidiary of the Company may act in any such capacity.

         6. Indenture. The Company issued the Securities under an Indenture
dated as of April 15, 1999 (the "Indenture") between the Company and the
Trustee. The terms of the Securities include those stated in the Indenture and
those made part of the Indenture by reference to the Trust Indenture Act of
1939, as amended (15 U.S.C. Sections 77aaa-77bbbb) (the "TIA"), as in effect on
the date of execution of the Indenture. The Securities are subject to all such
terms, and Holders are referred to the Indenture and the TIA for a statement of
such terms and for the definitions of capitalized terms used but not defined
herein. The Securities are unsecured general obligations of the Company limited
to $500,000,000 in aggregate principal amount; provided, however, that the
authorized aggregate principal amount of the Securities may be increased before
or after the issuance of any Securities by a Board Resolution (or action
pursuant to a Board Resolution) to such effect. The Indenture provides for the
issuance of other series of debt securities (including the Securities, the "Debt
Securities") thereunder.

         7. Denominations, Transfer, Exchange. The Securities are in registered
form without coupons in denominations of $1,000 and integral multiples of
$1,000. The transfer of Securities may be registered and Securities may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and to pay any taxes and fees required by law or permitted by
the Indenture.

         8. Amendments and Waivers. Subject to certain exceptions and
limitations, the Indenture or the Securities may be amended or supplemented with
the consent of the Holders of at least a majority in principal amount of the
then outstanding Debt Securities of all series affected by such amendment or
supplement (acting as one class), and any existing or past Default or Event of
Default under, or compliance with any provision of, the Indenture may be waived
(other than any continuing Default or Event of Default in the payment of the
principal of, premium (if any) on or interest on the Securities) by the Holders
of at least a majority in principal amount of the then outstanding Debt
Securities of any series or of all series (acting as one class) in accordance
with the terms of the Indenture. Without the consent of any Holder, the Company
and the Trustee may amend or supplement the Indenture or the Securities or waive
any provision of either: (i) to cure any ambiguity, omission, defect or
inconsistency; (ii) to provide for the assumption of the obligations of the
Company under the Indenture to Holders in the case of the merger, consolidation
or sale, lease, conveyance, transfer or other disposition of all or
substantially all of the assets of the Company; (iii) to provide for
uncertificated Securities in addition to or in place of certificated Securities
or to provide for the issuance of bearer Securities (with or without coupons);
(iv) to provide any security for the Securities or to add guarantees of the
Securities; (v) to comply with any requirement in order to effect or maintain
the qualification of the Indenture under the TIA; (vi) to add to the covenants
of the Company for the benefit of the Holders of the Securities, or to surrender
any right or power conferred by the Indenture upon the Company; (vii) to add any
additional Events of Default with respect to all or any series of the Debt
Securities; (viii) to change or eliminate any of the provisions of the
Indenture, provided that no outstanding Security is adversely affected in any
material respect; (ix) to supplement any of the provisions of the Indenture to
such extent as shall be necessary to permit or facilitate the defeasance and
discharge of the Securities pursuant to the Indenture; or (x) to evidence and
provide for the acceptance of appointment under the Indenture by a successor
Trustee with

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<PAGE>   9

respect to the Securities and to add to or change any of the provisions of the
Indenture as shall be necessary to provide for or facilitate the administration
of the trusts thereunder by more than one Trustee, pursuant to the requirements
of the Indenture.

         The right of any Holder to participate in any consent required or
sought pursuant to any provision of the Indenture (and the obligation of the
Company to obtain any such consent otherwise required from such Holder) may be
subject to the requirement that such Holder shall have been the Holder of record
of any Securities with respect to which such consent is required or sought as of
a date identified by the Company in a notice furnished to Holders in accordance
with the terms of the Indenture.

         Without the consent of each Holder affected, the Company may not (i)
reduce the amount of Debt Securities whose Holders must consent to an amendment,
supplement or waiver; (ii) reduce the rate of or change the time for payment of
interest, including default interest, on any Security; (iii) reduce the
principal of or premium on, or change the Stated Maturity of, any Security; (iv)
reduce the premium, if any, payable upon the redemption of any Security or
change the time at which any Security may or shall be redeemed; (v) change the
coin or currency in which any Security or any premium or interest with respect
thereto is payable; (vi) impair the right to institute suit for the enforcement
of any payment of principal of or premium (if any) or interest on any Security,
except as provided in the Indenture; (vii) make any change in the percentage of
principal amount of Debt Securities necessary to waive compliance with certain
provisions of the Indenture or make any change in the provision for
modification; or (viii) waive a continuing Default or Event of Default in the
payment of principal of or premium (if any) or interest on the Securities.

         A supplemental indenture that changes or eliminates any covenant or
other provision of the Indenture which has expressly been included solely for
the benefit of one or more particular series of Debt Securities under the
Indenture, or which modifies the rights of the Holders of Debt Securities of
such series with respect to such covenant or other provision, shall be deemed
not to affect the rights under the Indenture of the Holders of Debt Securities
of any other series.

         9. Defaults and Remedies. Events of Default are defined in the
Indenture and generally include: (i) default by the Company for 30 days in
payment of any interest on the Securities; (ii) default by the Company in any
payment of principal of or premium, if any, on the Securities when due and
payable; (iii) default by the Company in compliance with any of its other
covenants or agreements in, or provisions of, the Securities or in the Indenture
which shall not have been remedied within 90 days after written notice by the
Trustee or by the holders of at least 25% in principal amount of the Securities
then outstanding (or, in the event that other Debt Securities issued under the
Indenture are also affected by the default, then 25% in principal amount of all
outstanding Debt Securities so affected); or (iv) certain events involving
bankruptcy, insolvency or reorganization of the Company. If an Event of Default
occurs and is continuing, the Trustee or the Holders of at least 25% in
principal amount of the then outstanding Securities of the series affected by
such default (or, in the case of an Event of Default described in clause (iii)
above, if outstanding Debt Securities of other series are affected by such
Default, then at least 25% in principal amount of the then outstanding Debt
Securities so affected), may declare the principal of and interest on all the
Securities (or such Debt Securities) to be immediately due and payable, except
that in the case of an Event of Default arising from certain

                                      AA-7
<PAGE>   10

events of bankruptcy, insolvency or reorganization of the Company, all
outstanding Debt Securities under the Indenture become due and payable
immediately without further action or notice. The amount due and payable upon
the acceleration of any Security is equal to 100% of the principal amount
thereof plus accrued interest to the date of payment. Holders may not enforce
the Indenture or the Securities except as provided in the Indenture. The Trustee
may require indemnity reasonably satisfactory to it before it enforces the
Indenture or the Securities. Subject to certain limitations, Holders of a
majority in principal amount of the then outstanding Securities (or affected
Debt Securities) may direct the Trustee in its exercise of any trust or power.
The Trustee may withhold from Holders notice of any continuing default (except a
default in payment of principal, premium or interest) if it determines that
withholding notice is in their interests. The Company must furnish an annual
compliance certificate to the Trustee.

         10. Discharge Prior to Maturity. The Indenture with respect to the
Securities shall be discharged and canceled upon the payment of all of the
Securities and shall be discharged except for certain obligations upon the
irrevocable deposit with the Trustee of funds or U.S. Government Obligations
sufficient for such payment.

         11. Trustee Dealings with Company. The Trustee, in its individual or
any other capacity, may become the owner or pledgee of Securities and may make
loans to, accept deposits from, and perform services for the Company or its
Affiliates, and may otherwise deal with the Company or its Affiliates, as if it
were not Trustee.

         12. No Recourse Against Others. A director, officer, employee,
stockholder, partner or other owner of the Company or the Trustee, as such,
shall not have any liability for any obligations of the Company under the
Securities or for any obligations of the Company or the Trustee under the
Indenture or for any claim based on, in respect of or by reason of such
obligations or their creation. Each Holder by accepting a Security waives and
releases all such liability. The waiver and release shall be part of the
consideration for the issue of Securities.

         13. Authentication. This Security shall not be valid until
authenticated by the manual signature of the Trustee or an authenticating agent.

         14. CUSIP Numbers. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Securities as a convenience to the Holders of
the Securities. No representation is made as to the accuracy of such numbers as
printed on the Securities and reliance may be placed only on the other
identification numbers printed thereon.

         15. Abbreviations. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

                                      AA-8
<PAGE>   11

         The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture. Request may be made to:

         Conoco Inc.
         600 North Dairy Ashford
         Houston, Texas 77079
         Telephone:  (281) 293-2648
         Attention:  Capital Markets

                                      AA-9
<PAGE>   12

                     SCHEDULE OF EXCHANGES OF SECURITIES(3)

         The following exchanges of a part of this Global Security for other
Securities have been made:

<Table>
<Caption>
                                                                              Principal Amount
                               Amount of                 Amount of             of this Global           Signature of
                              Decrease in               Increase in          Security Following      Authorized Officer
                           Principal Amount          Principal Amount           Such Decrease           of Trustee or
 Date of Exchange       of this Global Security   of this Global Security       (or Increase)        Security Custodian
-----------------      ------------------------  ------------------------     -------------          ------------------
<S>                    <C>                       <C>                          <C>                    <C>

</Table>

--------
  (3)    This schedule to be included only if the Security is a Global Security.

                                     AA-10
<PAGE>   13

                                 ASSIGNMENT FORM

         To assign this Security, fill in the form below: (I) or (we) assign and
transfer this Security to

--------------------------------------------------------------------------------
             (Insert assignee's social security or tax I.D. number)

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

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

--------------------------------------------------------------------------------
              (Print or type assignee's name, address and zip code)

and irrevocably appoint
                        --------------------------------------------------------
as agent to transfer this Security on the books of the Company. The agent may
substitute another to act for him.

Date:                        Your Signature:
      -------------------                  -------------------------------------
                                           (Sign exactly as your name appears on
                                                the face of this Security)

Signature Guarantee:
                   -------------------------------------------------------------
                           (Participant in a Recognized Signature
                                Guaranty Medallion Program)

                                     AA-11

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