Document:

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                                 PROMISSORY NOTE

$ 135,000                          Dallas, Texas               December 9 , 1999

         FOR VALUE RECEIVED, Glenn D. Hart, a resident of Houston, Texas
("Maker") promises to pay to the order of Michael Petroleum Corporation
("Payee") at Houston, Texas (or such other place of payment as the holder
hereof may hereafter designate in writing), in immediately available funds
and in lawful money of the United States of America, the principal sum of One
Hundred Thirty-Five Thousand and No Hundredths DOLLARS ($135,000), together
with interest on the unpaid principal balance of this Note from time to time
outstanding until maturity at the Stated Rate and interest on all past due
amounts both principal and accrued interest, at the Past Due Rate, provided,
that for the full term of this Note the interest rate produced by the
aggregate of all sums paid or agreed to be paid to the holder of this Note
for the use, forbearance or detention of the debt evidenced hereby shall not
exceed the Highest Lawful Rate.

I. DEFINITIONS. As used in this Note, the following terms shall have the
respective meanings indicated:

         I.1 "BUSINESS DAY" means a day when national banks are open for
business in Dallas, Texas.

         I.2 "CHAPTER ONE" means Chapter One of Title 79 Texas Revised Civil
Statutes, 1925, as amended.

         I.3 "HIGHEST LAWFUL RATE" means the maximum nonusurious rate of
interest permitted on the execution date hereof by whichever of applicable
federal or Texas laws permit the higher maximum nonusurious interest rate. If
Chapter One establishes the Highest Lawful Rate, the Highest Lawful Rate
shall be the "indicated rate ceiling" (as defined in Chapter One).

         I.4 "MATURITY DATE" means the maturity of this Note, which is
earlier to occur of demand by the Payee or June 1, 2000.

         I.5 "PAST DUE RATE" means a rate per annum equal to the Highest
Lawful Rate; provided, however, that if, but only if, applicable law imposes
no maximum nonusurious rate of interest, then the Past Due Rate shall be a
rate per annum equal to eighteen percent (18%).

         f. "STATED RATE" means an annual rate of interest of ten percent (10%).

         II. COMPUTATION OF INTEREST. Interest on the outstanding principal
balance of this Note shall be computed from the date of execution of this
Note. Interest shall be computed for the actual number of days elapsed in a
year consisting of 360 days, unless the Highest Lawful Rate would thereby be
exceeded, in which event, to the extent necessary to avoid exceeding the
Highest Lawful Rate, interest shall be computed on the basis of the actual
number of days elapsed in the applicable calendar year in which accrued.

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         III.     PAYMENTS OF PRINCIPAL AND INTEREST.

         III.1 The principal balance of this Note, and all accrued and unpaid
interest, shall be due and payable on the Maturity Date.

         III.2 All payments on this Note shall be applied first to accrued
interest and the balance to principal.

         c. Any monies that become payable to Maker by reason of his equity
interest in the Payee or its affiliates will be first used to offset any
outstanding indebtedness under this Note.

         IV. NO USURY INTENDED; SPREADING. Notwithstanding any provision to
the contrary contained in this Note or any other document, it is expressly
provided that in no case or event shall the aggregate of (i) all interest on
the unpaid balance of this Note, accrued or paid on or from the date hereof
and (ii) the aggregate of any other amounts accrued or paid pursuant to this
Note or any other document, which under applicable laws are or may be deemed
to constitute interest upon the indebtedness evidenced by this Note from the
date hereof, ever exceed the Highest Lawful Rate. In this connection, it is
expressly stipulated and agreed that it is the intent of the Maker and the
Payee to contract in strict compliance with the applicable usury laws of the
State of Texas and of the United States, whichever from time to time permit
the higher rate of interest. In furtherance thereof, none of the terms of
this Note or of any other documents shall ever be construed to create a
contract to pay, as consideration for the use, forbearance or detention of
money, interest at a rate in excess of the Highest Lawful Rate. The Maker or
other parties now or hereafter becoming liable for payment of the
indebtedness evidenced by this Note shall never be liable for interest in
excess of the Highest Lawful Rate. If, for any reason whatever, the interest
paid or received on this Note during its full term produces a rate which
exceeds the Highest Lawful Rate, the holder of this Note shall refund to the
payor or, at the holder's option, credit against the principal of this Note
such portion of said interest as shall be necessary to cause the interest
paid on this Note to produce a rate equal to the Highest Lawful Rate. All
sums paid or agreed to be paid to the holder of this Note for the use,
forbearance or detention of the indebtedness evidenced hereby shall, to the
extent permitted by applicable law, be amortized, prorated, allocated and
spread throughout the full term of this Note until payment in full of the
principal (including the period of any renewal or extension hereof), so that
the interest hereon throughout the full term of this Note shall not exceed
the maximum amount permitted by applicable law. The provisions of this
paragraph shall control all agreements, whether now or hereafter existing and
whether written or oral, between the Maker and the Payee.

         V. DEFAULT. If Maker shall fail to make any payment of interest or
principal on this Note when due, the owner or holder hereof may, at its, his
or her option, declare the unpaid balance of principal and accrued interest
on this Note at once mature and payable, setoff against the amounts then
owing under this Note or any other documents any and all monies, securities
and other properties of the Maker in the possession, custody or control of,
or on deposit with, or otherwise owed to the Maker by, the Payee or any other
holder hereof, including without limitation all such monies, securities and
other properties held in general or special accounts or for safekeeping or as
collateral or otherwise, and to take such other actions and enforce such
other remedies as are available under applicable law.

         VI. NO WAIVER BY THE PAYEE. No delay or omission of the Payee or any
other holder hereof to exercise any power, right or remedy accruing to the Payee
or any other holder hereof shall impair any

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such power, right or remedy or shall be construed to be a waiver of the right
to exercise any such power, right or remedy.

         VII. COSTS AND ATTORNEYS' FEES. If any holder of this Note retains
an attorney in connection with any default or to collect, enforce or defend
this Note in any lawsuit or in any probate, reorganization, bankruptcy or
other proceeding, or if the Maker sues any holder in connection with this
Note and does not prevail, then Maker agrees to pay to each such holder, in
addition to principal and interest, all reasonable costs and expenses
incurred by such holder in connection with such default or in trying to
collect this Note or in any such suit or proceeding, including reasonable
attorneys' fees. To the extent not prohibited by applicable law, the Maker
will pay all reasonable costs and expenses and reimburse the Payee for any
and all reasonable expenditures of every character incurred or expended from
time to time, relating to the Payee's exercise of any of its rights and
remedies hereunder or at law, including, without limitation, all appraisal
fees, consulting fees, filing fees, taxes, brokerage fees and commissions,
Uniform Commercial Code search fees, fees incident to other title searches
and reports, escrow fees, attorneys' fees, legal expenses, court costs,
auctioneer fees and other fees incurred in connection with liquidation of any
collateral and all other professional fees. Any amount to be paid hereunder
by the Maker to the Payee shall be a demand obligation owing by the Maker to
the Payee and shall bear interest from the date of expenditure until paid at
the per annum rate provided in this Note for interest on past due payments of
principal and interest.

         VIII. WAIVERS BY THE MAKER AND OTHERS. The Maker and any and all
co-makers, endorsers, guarantors and sureties severally waive notice
(including, but not limited to, notice of intent to accelerate and notice of
acceleration, notice of protest and notice of dishonor), demand, presentment
for payment, protest, diligence in collecting and the filing of suit for the
purpose of fixing liability and consent that the time of payment hereof may
be extended and re-extended from time to time without notice to any of them.
Each such person agrees that his, her or its liability on or with respect to
this Note shall not be affected by any release of or change in any guaranty
or security at any time existing or by any failure to perfect or to maintain
perfection of any lien against or security interest in any such security or
the partial or complete unenforceability of any guaranty or other surety
obligation, in each case in whole or in part, with or without notice and
before or after maturity.

         IX. PARAGRAPH HEADINGS. Paragraph headings appearing in this Note
are for convenient reference only and shall not be used to interpret or limit
the meaning of any provision of this Note.

         X. GOVERNING LAW. This Note shall be governed by and construed in
accordance with the laws of the State of Texas and the United States of
America from time to time in effect. Dallas County, Texas shall be proper
place of venue for suit hereon. The Maker and any and all co-makers,
endorsers, guarantors and sureties irrevocably agree that any legal
proceeding in respect of this Note or any of the other Loan Documents shall
be brought in the district courts of Dallas County, Texas, or the United
States District Court for the Northern District of Texas.

         XI. SUCCESSORS AND ASSIGNS. This Note and all the covenants and
agreements contained herein shall be binding upon, and shall inure to the
benefit of, the respective legal representatives, heirs, trustees,
beneficiaries, successors and assigns of the Maker and the Payee.

         XII. RECORDS OF PAYMENTS. The records of the Payee shall be prima
facie evidence of the amounts owing on this Note.

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         XIII. SEVERABILITY. If any provision of this Note shall be
determined by any court of competent jurisdiction to be illegal, invalid or
unenforceable, then that provision only shall be of no force and effect and
shall be deemed excised herefrom, and the remainder of the provisions of this
Note shall be unaffected thereby, the provisions of this Note being severable
in each and every instance. Furthermore, in lieu of any illegal,
unenforceable or invalid provision, there shall be automatically added to
this Note a provision as similar to such illegal, invalid or unenforceable
provision as may be possible and be legal, valid and enforceable.

         XIV. SALE AND ASSIGNMENT. The Payee reserves the right, in its sole
discretion, without notice to the Maker or any other person, to sell
participations or assign its interest, or both, in all or any part of this
Note or any loan evidenced by this Note.

         XV. PREPAYMENT. The Maker may at any time pay the full amount or any
part of this Note without the payment of any premium or fee. All prepayments
hereon shall be applied first to accrued and unpaid interest due under this
Note, and then to the outstanding principal balance of this Note in inverse
order of maturity.

         XVI. BUSINESS LOANS. The Maker warrants and represents to the Payee
and all other holders of this Note that all loans evidenced by this Note are
and will be for business, commercial, investment or other similar purpose and
not primarily for personal, family, household or agricultural use, as such
terms are used in Chapter One.

         XVII. ENTIRE AGREEMENT. This Note embodies the entire agreement and
understanding between the Payee and the Maker and other parties with respect
to the loans to be evidenced by this Note and supersede all prior conflicting
or inconsistent agreements, consents and understandings relating to such
subject matter. The Maker acknowledges and agrees that there are no oral
agreements between the Maker and the Payee which have not been incorporated
in this Note.

                                     MAKER:

                                     /S/ GLEND D. HART
                                     ----------------------------------------
                                     GLENN D. HART

                                       -4-<PAGE>

                                                                     Exhibit 4.1

                                 iSKY, INC.(SM)

COMMON STOCK                                                        COMMON STOCK

INCORPORATED UNDER THE LAWS                                                CUSIP
OF THE STATE OF MARYLAND

THIS CERTIFIES that

is the owner of

FULLY PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $.01 EACH OF THE COMMON
STOCK OF iSKY, INC.

transferable on the books of the Corporation by the owner hereof in person or by
duly authorized attorney upon surrender of this certificate properly endorsed.
This certificate and the shares represented hereby are issued and shall be held
subject to all the provisions of the articles of incorporation of the
Corporation (a copy of which is on file with the Transfer Agent) to all of which
the ohlder by acceptance hereof consents. This certificate is not valid until
countersigned and registered by the Transfer Agent and Registrar.

         WITNESS the facsmilie seal of the Corporation and the facsimile
signatures of its duly authorized officers.

Dated:

Chief Operating Officer                    President and Chief Executive Officer

<PAGE>

         A full statement or summary of the designations and any preferences,
conversion and other rights, voting powers, restrictions, limitations as to
dividends, qualifications, and terms and conditions of redemption of the stock
of each class which the corporation is authorized to issue and the authority of
the board of directors to set the relative rights and preferences of any series
of capital stock, will be furnished to any shareholder, without charge, upon
request to the secretary of the corporation at the corporation's principal
office.

         The following abbreviations, when used in the inscription on the face
of this certificate shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM - as tenants in common

TEN ENT - as tenants by the entireties

JT TEN - as joint tenants with right of survivorship
              and not as tenants in common

UNIF GIFT MIN ACT    -     Under the ___________ Uniform Gifts
                           to Minors Act _______________ as
                           custodian for  _________________

         Additional abbreviations may also be used though not in the above list.

For value received, ___________ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
IDENTIFYING NUMBER OF ASSIGNEE

________________________________________________________________________________
________________________________________________________________________________

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS INCLUDING POSTAL ZIP CODE OF
ASSIGNEE.

________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
__________________________________________________________________________Shares
of the Common Stock represented by the within Certificate, and do hereby
irrevocably constitute and appoint

________________________________________________________________________________
Attorney to transfer the said stock on the books of the within-named Corporation
with full power of substitution in the premises.

Dated, ____________________________

                                         _______________________________________

NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS
WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR, WITHOUT
ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.

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