Document:

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                                                                   Exhibit 10.23
                       10% SENIOR SECURED CONVERTIBLE NOTE
                              DATED MARCH 27, 2000

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED
STATES SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT"). THE HOLDER HEREOF,
BY PURCHASING SUCH SECURITIES AGREES FOR THE BENEFIT OF THE COMPANY THAT SUCH
SECURITIES MAY BE OFFERED, SOLD OR OTHERWISE TRANSFERRED ONLY (A) TO THE
COMPANY, (B) PURSUANT TO THE EXEMPTION FROM REGISTRATION UNDER THE 1933 ACT
PROVIDED BY RULE 144 THEREUNDER, IF AVAILABLE, OR (C) IF REGISTERED UNDER THE
1933 ACT AND APPLICABLE STATE SECURITIES LAWS. IN ADDITION, A SECURITIES
PURCHASE AGREEMENT, REGISTRATION RIGHTS AGREEMENT, LICENSE AGREEMENT AND
SECURITY AGREEMENT, EACH DATED AS OF THE DATE HEREOF, COPIES OF WHICH MAY BE
OBTAINED FROM THE COMPANY AT ITS PRINCIPAL EXECUTIVE OFFICE, CONTAIN CERTAIN
ADDITIONAL AGREEMENTS AMONG THE PARTIES, INCLUDING, WITHOUT LIMITATION,
PROVISIONS WHICH, AMONG OTHER THINGS, (A) SPECIFY VOLUNTARY AND MANDATORY
REPAYMENT, PREPAYMENT AND REDEMPTION RIGHTS AND OBLIGATIONS AND (B) SPECIFY
EVENTS OF DEFAULT FOLLOWING WHICH THE REMAINING BALANCE DUE AND OWING HEREUNDER
MAY BE ACCELERATED OR CONVERTED.

         On or before March 31, 2001 (the "Maturity Date"), AHT CORPORATION, a
Delaware corporation (the "Company"), for value received, hereby promises to pay
to CYBEAR, INC., a Delaware corporation (the "Holder"), the principal sum of
Four Million Dollars ($4,000,000) and to pay interest thereon from the date
hereof at the rate of ten percent (10%) per annum (the "Interest Rate").

         Interest shall be paid quarterly, in arrears, on (i) June 30, 2000,
September 30, 2000 and December 31, 2000 (unless such day is not a Business Day,
in which event on the next succeeding Business Day) (each an "Interest Payment
Date"), (ii) the Maturity Date, and (iii) the date the principal amount of the
Convertible Note shall be declared to be or shall automatically become due and
payable, on the principal sum hereof outstanding in like coin or currency, from
the most recent Interest Payment Date to which interest has been paid on this
Convertible Note, or if no interest has been paid on this Convertible Note, from
the date of this Convertible Note until payment in full of the principal sum
hereof has been made until the principal hereof is paid in full.

         Past due amounts (including interest, to the extent permitted by law)
will also accrue interest at 13% per annum or, if less, the maximum rate
permitted by applicable law, and will be payable on demand (the "Default
Interest Rate"). Interest on this Convertible Note will be calculated on the
basis of a 365-day year. All payments of principal and interest hereunder shall
be made for the benefit of the Holder at the Holder's account at First Union
National Bank, 5355 Town Center Road, Suite 101, Boca Raton, Florida, pursuant
to the terms of the Purchase Agreement (hereafter defined).
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         This Convertible Note is referred to in that Securities Purchase
Agreement (the "Purchase Agreement"), the Registration Rights Agreement, the
Letter Agreement and the Security Agreement, each dated as of the date hereof
between the Company and the Holder (collectively, the "Agreements"). The
Agreements contain certain additional agreements among the parties with respect
to the terms of this Convertible Note, including, without limitation, provisions
which (i)specify voluntary and mandatory repayment, prepayment and redemption
rights and obligations and (ii) specify Events of Default (as defined in the
Purchase Agreement) following which the remaining balance due and owing
hereunder may be accelerated or converted. All such provisions are an integral
part of this Convertible Note and are incorporated herein by reference.
Capitalized terms used but not defined herein shall have the meanings set forth
in the Agreements. This Convertible Note is transferable and assignable to one
or more purchasers, in accordance with the limitations set forth in the
Agreements.

         The Company shall keep a register (the "Register") in which shall be
entered the name and address of the registered holder of this Convertible Note
and particulars of this Convertible Note held by such holder and of all
transfers of this Convertible Note. References to the Holder shall mean the
Person listed in the Register as the registered holder of such Convertible Note.
The ownership of this Convertible Note shall be proven by the Register.

         1. Certain Terms Defined. All terms defined in the Purchase Agreement
and not otherwise defined herein shall have for purposes hereof the meanings
provided for therein.

         2. Payment of Principal. The Company shall repay the remaining unpaid
balance on this Convertible Note on the Maturity Date. The Company may, and
shall be obligated to, prepay all or a portion of this Convertible Note on the
terms specified in the Agreements.

3.       Conversion Terms.

         3.1 Conversion of Convertible Note. The Holder shall have the right, at
its option, at any time and from time to time, after the date hereof to convert
the principal amount of this Convertible Note, or any portion of such principal
amount in the minimum amount of $1,000 or any integral multiple thereof, into
that number of fully paid and nonassessable shares of Common Stock (as such
shares shall then be constituted) determined pursuant to this Section 4.1. The
number of shares of Common Stock to be issued upon each conversion of this
Convertible Note shall be determined by dividing the Conversion Amount (as
defined below) by the Conversion Price in effect on the date (the "Conversion
Date") a Notice of Conversion is delivered to the Company by the Holder by
facsimile or other reasonable means of communication dispatched prior to 11:00
p.m., Eastern Standard Time PROVIDED, HOWEVER, the aggregate number of shares to
be issued pursuant to the conversion of this Convertible Note and all other of
the Convertible Notes shall never exceed the Maximum Number of Shares. The term
"Conversion Amount" means, with respect to any conversion of this Convertible
Note, the sum of (i) the principal amount of this Convertible Note to be
converted in such conversion (including any premium thereon pursuant to the
Purchase Agreement) plus (ii) accrued and unpaid interest, if any, on such
principal amount at the interest rates provided in this Convertible Note to the
Conversion Date plus (iii) Default Interest, if any, on the interest referred to
in the immediately preceding clause (ii).

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         3.2 Conversion Price. The Conversion Price of this Convertible Note
(the "Conversion Price") per share shall be the lower of (i) 80% of the Average
Market Price per share of Common Stock on the Conversion Date; or (ii) $4.34
(the "Conversion Price"), subject to equitable adjustments for stock splits,
stock dividends or rights offerings by the Company relating to the Company's
securities or the securities of any Subsidiary of the Company, combinations,
recapitalization, reclassifications, extraordinary distributions and similar
events, as provided in the Purchase Agreement.

3.3      Authorized Shares.

        (a) Consistent with Section 7.12 of the Purchase Agreement, the Company
(i) acknowledges that it shall irrevocably instruct its transfer agent to issue
certificates for the Common Stock issuable upon conversion of this Convertible
Note and (ii) agrees that its issuance of this Convertible Note shall constitute
full authority to its officers and agents who are charged with the duty of
executing stock certificates to execute and issue the necessary certificates for
shares of Common Stock in accordance with the terms and conditions of this
Convertible Note.

        (b) If at any time a Holder of this Convertible Note submits a Notice of
Conversion, (i) the Company does not have sufficient authorized but unissued
shares of Common Stock available to effect such conversion in full in accordance
with the provisions of this Section 4 (each, a "Conversion Default"), the
Company shall issue to the Holder all of the shares of Common Stock which are
then available to effect such conversion. The portion of this Convertible Note
which the Holder included in its Conversion Notice and which exceeds the amount
which is then convertible into available shares of Common Stock (the "Excess
Amount") shall, notwithstanding anything to the contrary contained herein, not
be convertible into Common Stock in accordance with the terms hereof until (and
at the Holder's option at any time after) the date additional shares of Common
Stock are authorized by the Company, or its stockholders, as applicable, at
which time the Conversion Price in respect thereof shall be the lower of (i) the
Conversion Price on the Conversion Default Date (as defined below) and (ii) the
Conversion Price on the Conversion Date thereafter elected by the Holder in
respect thereof.

3.4      Method of Conversion.

        (a) Notwithstanding anything to the contrary set forth herein, upon
conversion of this Convertible Note in accordance with the terms hereof, the
Company shall not be required to physically surrender this Convertible Note to
the Holder unless the entire unpaid principal amount of this Convertible Note is
so converted. The Company and the Holder shall maintain records showing the
principal amount so converted and the date of such conversions or shall use such
other method, reasonably satisfactory to the Holder and the Company, so as not
to require physical surrender of this Convertible Note upon each such
conversion. In the event of any dispute or discrepancy, such records of the
Company shall be controlling and determinative in the absence of manifest error.
Notwithstanding the foregoing, if any portion of this Convertible Note is
converted as aforesaid, the Company may not transfer this Convertible Note
unless the Holder first physically surrenders this Convertible Note to the
Company, whereupon the Company will forthwith issue and deliver upon the order
of the Holder a new note of like tenor, registered as the Holder (upon payment
by the Holder of any applicable transfer taxes), may

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request, representing in the aggregate the remaining unpaid principal amount of
this Convertible Note. The Holder and any assignee, by acceptance of this
Convertible Note, acknowledge and agree that, by reason of the provisions of
this paragraph, following conversion of a portion of this Convertible Note, the
unpaid and unconverted principal amount of this Convertible Note represented by
this Convertible Note may be less than the amount stated on the face hereof.

        (b) The Company shall not be required to pay any tax which may be
payable in respect of any transfer involved in the issuance and delivery of
shares of Common Stock or other securities or property on conversion of this
Convertible Note in a name other than that of the Holder (or in street name),
and the Company shall not be required to issue or deliver any such shares or
other securities or property unless and until the person or persons (other than
the Holder or the custodian in whose street name such shares are to be held for
the Holder's account) requesting the issuance thereof shall have paid to the
Company the amount of any such tax or shall have established to the satisfaction
of the Company that such tax has been paid.

        (c) Upon receipt by the Company of a Notice of Conversion, the Holder
shall be deemed to be the holder of record of the Common Stock issuable upon
such conversion on the Conversion Date, the outstanding principal amount and the
amount of accrued and unpaid interest on this Convertible Note shall be reduced
to reflect such conversion, and, unless the Company defaults on its obligations
under this Article 4, all rights with respect to the portion of this Convertible
Note being so converted shall forthwith terminate except the right to receive
the Common Stock or other securities, cash or other assets, as herein provided,
on such conversion. If the Holder shall have given a Notice of Conversion as
provided herein, the Company's obligation to issue and deliver the certificates
for shares of Common Stock shall be absolute and unconditional, irrespective of
the absence of any action by the Holder to enforce the same, any waiver or
consent with respect to any provision thereof, the recovery of any judgment
against any person or any action by the Holder to enforce the same, any waiver
or consent with respect to any provision thereof, the recovery of any judgment
against any person or any action to enforce the same, any failure or delay in
the enforcement of any other obligation of the Company to the holder of record,
or any setoff, counterclaim, recoupment, limitation or termination, or any
breach or alleged breach by the Holder of any obligation to the Company, and
irrespective of any other circumstance which might otherwise limit such
obligation of the Company to the Holder in connection with such conversion. The
date of receipt of such Notice of Conversion shall be the Conversion Date so
long as it is received before 11:00 p.m., Eastern Standard Time, on such date.

        (d) Notwithstanding the foregoing, if the Holder has not received
certificates for all shares of Common Stock prior to the second (2nd) business
day after the expiration of the Deadline with respect to a conversion of any
portion of this Convertible Note following delivery of a properly completed
Notice of Conversion for any reason, then (unless the Holder otherwise elects to
retain its status as a holder of Common Stock by so notifying the Company), the
Holder shall regain the rights of a Holder of this Convertible Note with respect
to such unconverted portions of this Convertible Note and the Company shall, as
soon as practicable, return such unconverted Convertible Note to the holder or,
if the Convertible Note has not been surrendered, adjust its records to reflect
that such portion of this Convertible Note has not been converted. In all cases,
the Holder shall retain all of its rights and remedies for the Company's failure
to convert this Convertible Note.

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        (e) In lieu of delivering physical certificates representing the shares
of Common Stock assessable upon conversion, provided the Company's transfer
agent is participating in the Depository Trust Company ("DTC") Fast Automated
Securities Transfer program, upon request of the Holder and its compliance with
the provisions contained in Section 4.1 and in this Section 4.4, the Company
shall use its best efforts to cause its transfer agent to electronically
transmit the shares of Common Stock assessable upon conversion to the Holder by
crediting the account of Holder's Prime Broker with DTC through its Deposit
Withdrawal Agent Commission system.

        4. Modification of Convertible Note. This Convertible Note may not be
modified without prior written consent of the Company and the Holder.

        5. Usury. All agreements in this Convertible Note and in the other
Transaction Agreements are expressly limited so that in no contingency or event
whatsoever, whether by reason of advancement or acceleration of maturity of the
Obligations, or otherwise, shall the amount paid or agreed to be paid hereunder
or thereunder for the use, forbearance or detention of money exceed the highest
lawful rate permitted under applicable usury laws. If, from any circumstance
whatsoever, fulfillment of any provision of this Convertible Note or any of the
other Transaction Agreements, at the time performance of such provision shall be
due, shall involve transcending the limit of validity prescribed by law which a
court of competent jurisdiction may deem applicable hereto, then, ipso facto,
the obligation to be fulfilled shall be reduced to the limit of such validity
and if, from any circumstance whatsoever, the Holder shall ever receive as
interest an amount which would exceed the highest lawful rate, the receipt of
such excess shall be deemed a mistake and shall be canceled automatically or, if
theretofore paid, such excess shall be held in trust by the Holder for the
benefit of the Company and shall be credited against the principal amount of the
Convertible Note to which the same may lawfully be credited, and any portion of
such excess not capable of being so credited shall be rebated to the Company.

        6. Miscellaneous. This Convertible Note 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 said State. The parties
hereto, including all guarantors or endorsers, hereby waive presentment, demand,
notice, protest and all other demands and notices in connection with the
delivery, acceptance, performance and enforcement of this Convertible Note,
except as specifically provided herein, and assent to extensions of the time of
payment, or forbearance or other indulgence without notice. The Company hereby
submits to the exclusive jurisdiction of the United States District Court for
the Southern District of Florida and of any Florida state court sitting in Palm
Beach County for purposes of all legal proceedings arising out of or relating to
this Convertible Note. The Company irrevocably waives, to the fullest extent
permitted by law, any objection which it may now or hereafter have to the laying
of the venue of any such proceeding brought in such a court and any claim that
any such proceeding brought in such a court has been brought in an inconvenient
forum.

                  The Holder of this Convertible Note by acceptance of this
Convertible Note agrees to be bound by the provisions of this Convertible Note
which are expressly binding on such Holder.

                  This Convertible Note has been executed, delivered and shall
at all times be held outside the State of Florida.

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                  IN WITNESS WHEREOF, the Company has caused this Note to be
executed in its name, and its corporate seal to be hereunto affixed by its
proper officers thereunder duly authorized.

Date: March 27, 2000

                                     AHT CORPORATION
(Corporate Seal)

                                     By: /s/ Jonathan Edelson
                                         --------------------------------------
                                         Name:  Jonathan Edelson
                                         Title: Chairman and Chief Executive
                                                Officer

                                       6<PAGE>   1
                                                                   Exhibit 10.24

                                     WARRANT

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED
STATES SECURITIES ACT OF 1933, AS AMENDED (THE "1933 ACT"). THE HOLDER HEREOF,
BY PURCHASING SUCH SECURITIES AGREES FOR THE BENEFIT OF THE COMPANY THAT SUCH
SECURITIES MAY BE OFFERED, SOLD OR OTHERWISE TRANSFERRED ONLY (A) TO THE
COMPANY, (B) PURSUANT TO THE EXEMPTION FROM REGISTRATION UNDER THE 1933 ACT
PROVIDED BY RULE 144 THEREUNDER, IF AVAILABLE, OR (C) IF REGISTERED UNDER THE
1933 ACT AND APPLICABLE STATE SECURITIES LAWS. IN ADDITION, A SECURITIES
PURCHASE AGREEMENT, REGISTRATION RIGHTS AGREEMENT, LETTER AGREEMENT AND SECURITY
AGREEMENT, EACH DATED AS OF THE DATE HEREOF, COPIES OF WHICH MAY BE OBTAINED
FROM THE COMPANY AT ITS PRINCIPAL EXECUTIVE OFFICE, CONTAIN CERTAIN ADDITIONAL
AGREEMENTS AMONG THE PARTIES.

                               WARRANT TO PURCHASE

                     COMMON STOCK, PAR VALUE $.01 PER SHARE

                               OF AHT CORPORATION

         This certifies that, for value received, Cybear, Inc. or registered
assigns (the "Warrantholder"), is entitled to purchase from AHT CORPORATION (the
"Company"), subject to the provisions of this Warrant, at any time and from time
to time until 5:00 p.m. Eastern Standard Time on March 31, 2005, three hundred
thousand (300,000) shares of the Company's Common Stock, par value $.01 per
share (the "Warrant Shares"). The purchase price payable upon the exercise of
this Warrant shall be $4.34 per Warrant Share. The Warrant Price and the number
of Warrant Shares which the Warrantholder is entitled to purchase is subject to
adjustment upon the occurrence of the contingencies set forth in Section 3 of
this Warrant; as adjusted from time to time, such purchase price is hereinafter
referred to as the "Warrant Price."

         This Warrant, evidencing the right to purchase Common Stock of the
Company, is referred to in, among other agreements, that Securities Purchase
Agreement (the "Purchase Agreement") and the Registration Rights Agreement each
dated March 27, 2000, between the Company and the Warrantholder (collectively,
the "Agreements"). The Agreements contain certain additional agreements among
the parties with respect to the terms of this Warrant. All such provisions are
an integral part of this Warrant and are incorporated herein by reference.
Capitalized terms used but not defined herein shall have the meanings set forth
in the Agreements.

         This Warrant is subject to the following terms and conditions:
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1.       Exercise of Warrant.

         (a) This Warrant may be exercised in whole or in part but not for a
fractional share. Upon delivery of this Warrant at the offices of the Company or
at such other address as the Company may designate by notice in writing to the
registered holder hereof with the Subscription Form annexed hereto duly
executed, accompanied by payment of the Warrant Price for the number of Warrant
Shares purchased (in cash, by certified, cashier's or other check acceptable to
the Company, by Common Stock of the Company having a Market Value (as
hereinafter defined) equal to the aggregate Warrant Price for the Warrant Shares
to be purchased, or any combination of the foregoing), the registered holder of
this Warrant shall be entitled to receive a certificate or certificates for the
Warrant Shares so purchased. Such certificate or certificates shall be promptly
delivered to the Warrantholder. Upon any partial exercise of this Warrant, the
Company shall promptly execute and deliver a new Warrant of like tenor for the
balance of the Warrant Shares purchasable hereunder.

         (b) In lieu of exercising this Warrant pursuant to Section 1(a), the
holder may elect to receive shares of Common Stock equal to the value of this
Warrant determined in the manner described below (or any portion thereof
remaining unexercised) upon delivery of this Warrant at the offices of the
Company or at such other address as the Company may designate by notice in
writing to the registered holder hereof with the Notice of Cashless Exercise
Form annexed hereto duly executed. In such event the Company shall issue to the
holder a number of shares of the Company's Common Stock computed using the
following formula:

                                   X = Y (A-B)
                                  ______________
                                       A

                       Where X = the number of shares of Common Stock
                                 to be issued to the holder.

                             Y = the number of shares of Common Stock
                                 purchasable under this Warrant (at the date of
                                 such calculation).

                             A = the Market Value of the Company's Common
                                 Stock on the business day immediately preceding
                                 the day on which the Notice of Cashless
                                 Exercise is received by the Company.

                             B = Warrant Price (as adjusted to the date of
                                 such calculation).

         (c) Subject to Section 7.9 of the Purchase Agreement, the Warrant
Shares deliverable hereunder shall, upon issuance, be fully paid and
non-assessable and the Company agrees that at all times during the term of this
Warrant it shall cause to be reserved for issuance such number of shares of its
Common Stock as shall be required for issuance and delivery upon exercise of
this Warrant.

         (d) For purposes of this Warrant, the Market Value of a share of Common
Stock on any date shall be determined as follows:
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                  (i) If the Common Stock is listed on Nasdaq, the closing price
         on the date of valuation;

                  (ii) If the Common Stock is listed on the New York Stock
         Exchange or the American Stock Exchange, the closing price on such
         exchange on the date of valuation;

                  (iii) If neither (i) nor (ii) apply but the Common Stock is
         quoted in the over-the-counter market, another recognized exchange, on
         the pink sheets or the OTC Bulletin Board, the mean between the high
         reported "bid" prices thereof on the date of valuation; and

                  (iv) if the Common Stock is not traded on a national
         securities exchange or in the over-the-counter market, the fair market
         value of a share of Common Stock on such date as determined in good
         faith by the Board of Directors.

If the Warrantholder disagrees with the determination of the Market Value of any
securities of the Company determined by the Board of Directors under Section
1(d)(iv), the Market Value of such securities shall be determined by an
independent appraiser acceptable to the Company and the holder (or, if they
cannot agree on such an appraiser, by an independent appraiser selected by each
of them, and Market Value shall be the median of the appraisals made by such
appraisers). If there is one appraiser, the cost of the appraisal shall be
shared equally between the Company and the holder. If there are two appraisers,
each of the Company and the holder shall pay for its own appraisal.

The Company will, at the time of the exercise, exchange or transfer of this
Warrant, upon the request of the registered Warrantholder hereof, acknowledge in
writing its continuing obligation to afford to such Warrantholder or transferee
any rights (including, without limitation, any right to registration of the
Company's shares of Common Stock) to which such Warrantholder or transferee
shall continue to be entitled after such exercise, exchange or transfer in
accordance with the provisions of this Warrant, provided that if the registered
Warrantholder of this Warrant shall fail to make any such request, such failure
shall not affect the continuing obligation of the Company to afford to such
Warrantholder or transferee any such rights.

2.       Transfer or Assignment of Warrant.

         (a) Any assignment or transfer of this Warrant shall be made by
surrender of this Warrant at the offices of the Company or at such other address
as the Company may designate in writing to the registered holder hereof with the
Assignment Form annexed hereto duly executed and accompanied by payment of any
requisite transfer taxes, and the Company shall, without charge, execute and
deliver a new Warrant of like tenor in the name of the assignee for the portion
so assigned in case of only a partial assignment, with a new Warrant of like
tenor to the assignor for the balance of the Warrant Shares purchasable.

         (b) Prior to any assignment or transfer of this Warrant, the holder
thereof shall deliver an opinion of counsel to the Company to the effect that
the proposed transfer may be effected without registration under the Act.
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3. Adjustment of Warrant Price and Warrant Shares -- Anti-Dilution Provisions.

         (a) (1) Except as hereinafter provided, in case the Company shall at
any time after the date hereof issue any shares of Common Stock (including
shares held in the Company's treasury) without consideration, then, and
thereafter successively upon each issuance, the Warrant Price in effect
immediately prior to each such issuance shall forthwith be reduced to a price
determined by multiplying the Warrant Price in effect immediately prior to such
issuance by a fraction:

                           (A)      the numerator of which shall be the total
                                    number of shares of Common Stock outstanding
                                    immediately prior to such issuance, and

                           (B)      the denominator of which shall be the total
                                    number of shares of Common Stock outstanding
                                    immediately after such issuance.

For the purposes of any computation to be made in accordance with the provisions
of this clause (1), the following provisions shall be applicable: (i) Shares of
Common Stock issuable by way of dividend or other distribution on any stock of
the Company shall be deemed to have been issued and to be outstanding at the
close of business on the record date fixed for the determination of stockholders
entitled to receive such dividend or other distribution and shall be deemed to
have been issued without consideration. Shares of Common Stock issued otherwise
than as a dividend or other distribution, shall be deemed to have been issued
and to be outstanding at the close of business on the date of issue; and (ii)
the number of shares of Common Stock at any time outstanding shall not include
any shares then owned or held by or for the account of the Company.

                      (2) In case the Company shall at any time subdivide or
combine the outstanding shares of Common
Stock, the Warrant Price shall forthwith be proportionately decreased in the
case of the subdivision or proportionately increased in the case of combination
to the nearest one cent. Any such adjustment shall become effective at the close
of business on the date that such subdivision or combination shall become
effective.

         (b) In the event that the number of outstanding shares of Common Stock
is increased by a stock dividend payable in shares of Common Stock or by a
subdivision of the outstanding shares of Common Stock, which may include a stock
split, then from and after the time at which the adjusted Warrant Price becomes
effective pursuant to the foregoing Subsection (a) of this Section by reason of
such dividend or subdivision, the number of shares issuable upon the exercise of
this Warrant shall be increased in proportion to such increase in outstanding
shares. In the event that the number of outstanding shares of Common Stock is
decreased by a combination of the outstanding shares of Common Stock, then, from
and after the time at which the adjusted Warrant Price becomes effective
pursuant to such Subsection A of this Section by reason of such combination, the
number of shares issuable upon the exercise of this Warrant shall be decreased
in proportion to such decrease in outstanding shares.
<PAGE>   5
         (c) In the event of an adjustment of the Warrant Price, the number of
shares of Common Stock (or reclassified stock) issuable upon exercise of this
Warrant after such adjustment shall be equal to the number determined by
dividing:

                      (1) an amount equal to the product of (i) the number of
shares of Common Stock issuable upon
exercise of this Warrant immediately prior to such adjustment, and (ii) the
Warrant Price immediately prior to such adjustment, by

                      (2) the Warrant Price immediately after such adjustment.

         (d) In the case of (1) any reorganization or reclassification of the
outstanding shares of Common Stock (other than a change in par value, or from
par value to no par value, or from no par value to par value, or as a result of
a subdivision or combination) or (2) any consolidation of the Company with, or
merger of the Company with, another corporation, or in the case of any sale,
lease or conveyance of all, or substantially all, of the property, assets,
business and goodwill of the Company as an entity, the holder of this Warrant
shall thereafter have the right upon exercise to purchase the kind and amount of
shares of stock and other securities and property receivable upon such
reorganization, reclassification, consolidation, merger or sale by a holder of
the number of shares of Common Stock which the holder of this Warrant would have
received had all Warrant Shares issuable upon exercise of this Warrant been
issued immediately prior to such reorganization, reclassification,
consolidation, merger or sale, at a price equal to the Warrant Price then in
effect pertaining to this Warrant (the kind, amount and price of such stock and
other securities to be subject to adjustment as herein provided). The Company
shall not effect a transaction of the type described in clause (2) of this
sub-paragraph (D) unless upon or prior to the consummation thereof, the
Company's successor corporation, or if the Company shall be the surviving
company in any such transaction but is not the issuer of the shares of stock,
securities or other property to be delivered to the holders of the Company's
outstanding shares of Common Stock at the effective time thereof, then such
issuer, shall assume in writing the obligation hereunder to deliver to the
Warrantholder of this Warrant such shares of stock, securities, cash or other
property as such holder shall be entitled to purchase in accordance with the
provisions hereof.

         (e) In case the Company shall, at any time prior to the expiration of
this Warrant and prior to the exercise thereof, dissolve, liquidate or wind up
its affairs, the Warrantholder shall be entitled, upon the exercise thereof, to
receive, in lieu of the Warrant Shares of the Company which it would have been
entitled to receive, the same kind and amount of assets as would have been
issued, distributed or paid to it upon such Warrant Shares of the Company, had
it been the holder of record of shares of Common Stock receivable upon the
exercise of this Warrant on the record date for the determination of those
entitled to receive any such liquidating distribution. After any such
dissolution, liquidation or winding up which shall result in any distribution in
excess of the Warrant Price provided for by this Warrant, the Warrantholder may
at its option exercise the same without making payment of the aggregate Warrant
Price and in such case the Company shall upon the distribution to said
Warrantholder consider that the aggregate Warrant Price has been paid in full to
it and in making settlement to said Warrantholder, shall deduct from the amount
payable to such Warrantholder an amount equal to the aggregate Warrant Price.
Except as otherwise expressly provided in the prior paragraph, in the event of
any dissolution of the Company following the transfer of all or substantially
all of its properties or assets, the Company, prior to such dissolution, shall
at its expense deliver or cause to be delivered the stock
<PAGE>   6
and other securities and property (including cash, where applicable) receivable
by the holders of the Warrants after the effective date of such dissolution
pursuant to this sub-paragraph (E) to a bank or trust company having its
principal office in New York City, as trustee for the holder or holders of the
Warrants.

         (f) Except as otherwise expressly provided in this Section 2, upon any
reorganization, consolidation, merger or transfer (and any dissolution following
any transfer) referred to in this Section 2, this Warrant shall continue in full
force and effect and the terms hereof shall be applicable to the shares of stock
and other securities and property receivable on the exercise of this Warrant
after the consummation of such reorganization, consolidation or merger or the
effective date of dissolution following any such transfer, as the case may be,
and shall be binding upon the issuer of any such stock or other securities,
including, in the case of any such transfer, the person acquiring all or
substantially all of the properties or assets of the Company, whether or not
such person shall have expressly assumed the terms of this Warrant.

         (g) In case the Company shall, at any time prior to the expiration of
this Warrant and prior to the exercise thereof make a distribution of assets
(other than cash) or securities of the Company to its stockholders (the
"Distribution") the Warrantholder shall be entitled, upon the exercise thereof,
to receive, in addition to the Warrant Shares it is entitled to receive, the
same kind and amount of assets or securities as would have been distributed to
it in the Distribution had it been the holder of record of shares of Common
Stock receivable upon exercise of this Warrant on the record date for
determination of those entitled to receive the Distribution.

         (h) Irrespective of any adjustments in the number of Warrant Shares and
the Warrant Price or the number or kind of shares purchasable upon exercise of
this Warrant, this Warrant may continue to express the same price and number and
kind of shares as originally issued.

4.       Officer's Certificate.

         Whenever the number of Warrant Shares and the Warrant Price shall be
adjusted pursuant to the provisions hereof, the Company shall forthwith file at
its principal executive office an officers' certificate, signed by the Chairman
of the Board, President, or one of the Vice Presidents of the Company and by its
Chief Financial Officer or one of its Treasurers or Assistant Treasurers,
stating the adjusted number of Warrant Shares and the new Warrant Price
calculated to the nearest one hundredth and setting forth in reasonable detail
the method of calculation and the facts requiring such adjustment and upon which
such calculation is based. Each adjustment shall remain in effect until a
subsequent adjustment hereunder is required. A copy of such statement shall be
mailed to the Warrantholder at its address in the records of the Company in
accordance with the notice provision of the Securities Purchase Agreement. The
Company will forthwith mail a copy of each such certificate to each holder of a
Warrant, and will, on the written request at any time of any holder of a
Warrant, furnish to such holder a like certificate setting forth the Warrant
Price and the number and type of Shares at the time in effect and showing how it
was calculated.
<PAGE>   7
5.       Charges, Taxes and Expenses.

         The issuance of certificates for Warrant Shares upon any exercise of
this Warrant shall be made without charge to the Warrantholder for any tax or
other expense in respect to the issuance of such certificates, all of which
taxes and expenses shall be paid by the Company, and such certificates shall be
issued only in the name of the Warrantholder.

6.       No Dilution or Impairment.

         The Company will not, by amendment of its Articles of Incorporation or
By-laws, or through any reorganization, transfer of assets, consolidation,
merger, dissolution, issue or sale of securities or any other voluntary action,
avoid or seek to avoid the observance or performance of any of the terms of the
Warrants, but will at all times in good faith assist in the carrying out of all
such terms and in the taking of all such action as may be necessary or
appropriate in order to protect the rights of the holders of the Warrants, as
specified herein and in the Securities Purchase Agreement, against dilution (to
the extent specifically provided herein) or other impairment. Without limiting
the generality of the foregoing, the Company (a) will not increase the par value
of any shares of stock receivable on the exercise of the Warrants above the
amount payable therefor on such exercise, and (b) will not effect a subdivision
or split up of shares or similar transaction with respect to any class of the
Common Stock without effecting an equivalent transaction with respect to all
other classes of Common Stock.

7.       Notice of Record Date.  In case of

         (a) any taking by the Company of a record of the holders of any class
of its securities for the purpose of determining the holders thereof who are
entitled to receive any dividend or other distribution, or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, or

         (b) any capital reorganization of the Company, any reclassification or
recapitalization of the capital stock of the Company or any transfer of all or
substantially all the assets of the Company to or consolidation or merger of the
Company with or any voluntary or involuntary dissolution, liquidation or winding
up of the Company, or

         (c) events shall have occurred resulting in the voluntary or
involuntary dissolution, liquidation or winding up of the Company then and in
each such event the Company will mail or cause to be mailed to each holder of a
Warrant a notice specifying (i) the date on which any record is to be taken for
the purpose of any such dividend, distribution or right, and stating the amount
and character of such dividend, distribution or right, (ii) the date on which
any such reorganization, reclassification, recapitalization, transfer,
consolidation, merger, dissolution, liquidation or winding up is to take place,
and the time, if any is to be fixed, as of which the holders of record of Common
Stock shall be entitled to exchange their Common Stock for securities or other
property deliverable on such reorganization, reclassification, recapitalization,
transfer, consolidation, merger, dissolution, liquidation or winding up, and
(iii) the amount and character of any stock or other securities, or rights or
options with respect thereto, proposed to be issued or granted, the date of such
proposed issue or grant and the persons or class of persons to whom such
proposed issue or grant is to be offered or made. Such notice shall be mailed at
least thirty (30) days prior to the date specified in such notice on which any
such action is to be taken.
<PAGE>   8
8.       Exchange of Warrants.

         On surrender for exchange of any Warrant, properly endorsed, to the
Company, the Company, at its expense, will issue and deliver to or on the order
of the holder thereof a new Warrant or Warrants of like tenor, in the name of
such holder or as such holder (on payment by such holder or any applicable
transfer taxes) may direct, calling in the aggregate on the face or faces
thereof for the number of shares of Common Stock called for on the face or faces
of the Warrant or Warrants so surrendered.

9.       Replacement of Warrants.

         On receipt of evidence reasonably satisfactory to the Company of the
loss, theft, destruction or mutilation of any Warrant and, in the case of any
such loss, theft or destruction of any Warrant, on delivery of an indemnity
agreement or security reasonably satisfactory in form and amount to the Company
or, in the case of any such mutilation, on surrender and cancellation of such
Warrant, the Company, at its expense, will execute and deliver, in lieu thereof,
a new Warrant of like tenor.

10.      Warrant Agent.

         The Company may, by written notice to each holder of a Warrant, appoint
an agent having an office in New York, New York, for the purpose of issuing
shares of Common Stock on the exercise of the Warrants pursuant to Section 1,
exchanging Warrants pursuant to Section 7, and replacing Warrants pursuant to
Section 8, or any of the foregoing, and thereafter any such issuance, exchange
or replacement, as the case may be, shall be made at such office by such agent.

11.      Remedies.

         The Company stipulates that the remedies at law of the holder of this
Warrant in the event of any default or threatened default by the Company in the
performance of or compliance with any of the terms of this Warrant are not and
will not be adequate, and that such terms may be specifically enforced by a
decree for the specific performance of any agreement contained herein or by an
injunction against a violation of any of the terms hereof or otherwise.

12.      Negotiability, Etc.

         This Warrant is issued upon the following terms, to all of which each
Warrantholder or owner hereof by the taking hereof consents and agrees:

         (a) (a)subject to the terms of Section 2 of this Warrant, title to this
Warrant may be transferred by endorsement (by the Warrantholder hereof executing
the form of assignment at the end hereof) and delivery in the same manner as in
the case of a negotiable instrument transferable by endorsement and delivery;

         (b) (b)any person in possession of this Warrant properly endorsed is
authorized to represent himself as absolute owner hereof and is empowered to
transfer absolute title hereto by endorsement and delivery hereof to a bona fide
purchaser hereof for value; each prior taker or owner waives and renounces all
of his equities or rights in this Warrant in favor of each such
<PAGE>   9
bona fide purchaser, and each such bona fide purchaser shall acquire absolute
title hereto and to all rights represented hereby; and

         (c) (c)until this Warrant is transferred on the books of the Company,
the Company may treat the register Warrantholder hereof as the absolute owner
hereof for all purposes, notwithstanding any notice to the contrary.

13.      Notices.

         All notices and other communications from the Company to the registered
Warrantholder of this Warrant shall be given in writing (unless otherwise
specified herein) and shall be effective upon personal delivery, via facsimile
(upon receipt of confirmation of error-free transmission) or two business days
following deposit of such notice with an internationally recognized courier
service, with postage prepaid and addressed, to such address as may have been
furnished to the Company in writing by such registered Warrantholder or, until
any such registered Warrantholder furnishes to the Company an address, then to,
and at the address of, the last registered Warrantholder of this Warrant who has
so furnished an address to the Company.

14.      Miscellaneous.

         (a) (a)The terms of this Warrant shall be binding upon and shall inure
to the benefit of any successors or assigns of the Company and of the holder or
holders hereof and of the shares of Common Stock issued or issuable upon the
exercise hereof.

         (b) Except as otherwise set forth herein, no holder of this Warrant, as
such, shall be entitled to vote or receive dividends or be deemed to be a
stockholder of the Company for any purpose, nor shall anything contained in this
Warrant be construed to confer upon the holder of this Warrant, as such, any
rights of a stockholder of the Company or any right to vote, give or withhold
consent to any corporate action, receive notice of meetings, receive dividends
or subscription rights, or otherwise.

         (c) Receipt of this Warrant by the holder hereof shall constitute
acceptance of an agreement to the foregoing terms and conditions.

         (d) The Warrant and the performance of the parties hereunder shall be
construed and interpreted in accordance with the laws of the State of Delaware
and the parties hereunder consent and agree that the State and Federal Courts
which sit in Palm Beach County, Florida shall have exclusive jurisdiction with
respect to all controversies and disputes arising hereunder.

         (e) This Warrant and any term hereof may be changed, waived, discharged
or terminated only by an instrument in writing signed by the party against which
enforcement of such change, waiver, discharge or termination is sought.

         IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by
its duly authorized officer and its corporate seal to be affixed hereto.

Dated: March 27, 2000
<PAGE>   10
                                                  AHT CORPORATION

                                                  BY: /s/ Jonathan Edelson
`                                                   ________________________
                                                  Name:  Jonathan Edelson
                                                  Title: Chairman and Chief
                                                         Executive Officer
<PAGE>   11

                                SUBSCRIPTION FORM

                    (TO BE EXECUTED BY THE REGISTERED HOLDER
                     IF HE DESIRES TO EXERCISE THE WARRANT)

                  To:AHT CORPORATION

                  The undersigned hereby exercises the right to purchase
_________ shares of Common Stock, par value $.01 per share, covered by the
attached Warrant in accordance with the terms and conditions thereof, and
herewith makes payment of the Warrant Price for such shares in full. The
undersigned requests that a certificate for such shares of Common Stock be
registered in the name of _____________, whose address is
___________________________________________, and that such Certificate be
delivered to ____________ whose address is ____________________________.

                               _______________________________
                               NAME (please print)

                               _______________________________
                               SIGNATURE

                               (Signature must conform in all respects to the
                                name of the registered Warrantholder, as
                                specified on the face of the Warrant.)

                               _______________________________
                               SOCIAL SECURITY NUMBER (or Other
                               Identifying Number of Holder)

                               _______________________________
                                ADDRESS

DATED:
     ___________________

<PAGE>   12

                   NOTICE OF EXERCISE OF COMMON STOCK WARRANT
             PURSUANT TO NET ISSUE ("CASHLESS") EXERCISE PROVISIONS

               (TO BE EXECUTED BY THE REGISTERED WARRANTHOLDER IN
                ADDITION TO THE SUBSCRIPTION FORM, IF HE DESIRES
                 TO EXERCISE THE WARRANT IN A CASHLESS EXERCISE)
<TABLE>
<CAPTION>

<S>                            <C>                                    <C>
AHT Corporation                Aggregate Price of Warrant             $_______
555 White Plains Rd
Tarrytown, NY 10591
Attn:  John Edelson            Aggregate Price Being Exercised:       $_______

                               Warrant Price (per share):             $_______

                               Number of Shares of Common Stock
                               to be Issued Under this Notice:         _______

</TABLE>

<PAGE>   13

                                CASHLESS EXERCISE

Gentlemen:

                  The undersigned, registered holder of the Warrant to Purchase
Common Stock delivered herewith ("Warrant") hereby irrevocably exercises such
Warrant for, and purchases thereunder, shares of the Common Stock of AHT
CORPORATION, a Delaware corporation, as provided below. Capitalized terms used
herein, unless otherwise defined herein, shall have the meanings given in the
Warrant. The portion of the Aggregate Price (as hereinafter defined) to be
applied toward the purchase of Common Stock pursuant to this Notice of Exercise
is $________, thereby leaving a remainder Aggregate Price (if any) equal to
$________. Such exercise shall be pursuant to the net issue exercise provisions
of Section I. (b) of the Warrant; therefore, the holder makes no payment with
this Notice of Exercise. The number of shares to be issued pursuant to this
exercise shall be determined by reference to the formula in Section I.(b)of the
Warrant which requires the use of the Market Value (as defined in Section I.(d)
of the Warrant) of the Company's Common Stock in accordance with the provisions
thereof. To the extent the foregoing exercise is for less than the full
Aggregate Price of the Warrant, the remainder of the Warrant representing a
number of Shares equal to the quotient obtained by dividing the remainder of the
Aggregate Price by the Warrant Price (and otherwise of like form, tenor and
effect) may be exercised under Section I.(a) of the Warrant. For purposes of
this Notice the term "Aggregate Price" means the product obtained by multiplying
the number of shares of Common Stock for which the Warrant is exercisable times
the Warrant Price.

                               _______________________________
                               SIGNATURE

                               _______________________________
DATE:_______                   ADDRESS

<PAGE>   14
                                   ASSIGNMENT

(TO BE EXECUTED BY THE REGISTERED WARRANTHOLDER
IF HE DESIRES TO TRANSFER THE WARRANT)

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
unto _________________________________ (please print name and address of
transferee) the right to purchase shares of Common Stock of AHT CORPORATION,
evidenced by the within Warrant, and does hereby irrevocably constitute and
appoint __________________________ Attorney to transfer the said Warrant on the
books of the Company, with full power of substitution.

                               _______________________________
                               NAME (please print)

                               _______________________________
                                SIGNATURE

                                (Signature must conform in all respects to the
                                name of the registered Warrantholder, as
                                specified on the face of the Warrant.)

                               _______________________________
                                SOCIAL SECURITY NUMBER (or Other Identifying
                                Number of Holder)

IN THE PRESENCE OF:

__________________

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