<PAGE>   1
                                                                     EXHIBIT 4.3


                                     WARRANT

NEITHER THE SECURITIES REPRESENTED HEREBY NOR THE SECURITIES ISSUABLE UPON THE
EXERCISE HEREOF HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS AND MAY NOT BE
OFFERED, SOLD, PLEDGED, ASSIGNED, OR OTHERWISE TRANSFERRED UNLESS (1) A
REGISTRATION STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE SECURITIES
ACT AND ANY APPLICABLE STATE SECURITIES LAWS, OR (2) THE COMPANY RECEIVES AN
OPINION OF COUNSEL TO THE HOLDER OF THIS WARRANT OR SUCH SECURITIES, WHICH
COUNSEL AND OPINION ARE REASONABLY SATISFACTORY TO THE COMPANY, THAT THIS
WARRANT OR SUCH SECURITIES, AS APPLICABLE, MAY BE OFFERED, SOLD, PLEDGED,
ASSIGNED, OR OTHERWISE TRANSFERRED IN THE MANNER CONTEMPLATED WITHOUT AN
EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR APPLICABLE STATE
SECURITIES LAWS.



        THE TRANSFER OF THIS WARRANT IS RESTRICTED AS DESCRIBED HEREIN.



                        INTERSCIENCE COMPUTER CORPORATION

                            WARRANT FOR THE PURCHASE
                                       OF
                10,000 SHARES OF COMMON STOCK, WITHOUT PAR VALUE

                                                                  APRIL 18, 1998

        THIS CERTIFIES that, for value received, STEVE BIEGENZAHN (together with
all permitted assigns, the "Holder") is entitled to subscribe for, and purchase
from, INTERSCIENCE COMPUTER CORPORATION, a California corporation (the
"Company"), upon the terms and conditions set forth herein, at any time or from
time to time during the period commencing on April 18, 1998 (such date being
referenced to as the Initial Exercise Date), and terminating at 5:00 p.m., Los
Angeles local time, on the second anniversary of the Initial Exercise Date (the
"Exercise Period"). This Warrant is exercisable at an exercise price per share
equal to $1.00 per share; provided, however, that upon the occurrence of any of
the events specified in Section 5 hereof, the rights granted by this Warrant,
including the number of shares of Common Stock to be received upon such
exercise, shall be adjusted as therein specified.

        This Warrant is being issued pursuant to that certain Plan of
Reorganization of the Company.



<PAGE>   2



        Each share of Common Stock issuable upon the exercise hereof shall be
hereinafter referred to as a "Warrant Share".

        SECTION 1 EXERCISE OF WARRANT.

        This Warrant may be exercised during the Exercise Period, either in
whole or in part, by the surrender of this Warrant (with the election at the end
hereof duly executed) to the Company at its office at 5236 Colodny Drive, Suite
100, Agoura Hills, California 91301, or at such other place as is designated in
writing by the Company, together with a certified or bank cashier's check
payable to the order of the Company in an amount equal to the product of the
Exercise Price and the number of Warrant Shares for which this Warrant is being
exercised.

        SECTION 2 RIGHTS UPON EXERCISE; DELIVERY OF SECURITIES.

        Upon each exercise of the Holder's rights to purchase Warrant Shares,
the Holder shall be deemed to be the holder of record of the Warrant Shares,
notwithstanding that the transfer books of the Company shall then be closed or
certificates representing the Warrant Shares with respect to which this Warrant
was exercised shall not then have been actually delivered to the Holder. As soon
as practicable after each such exercise of this Warrant, the Company shall issue
and deliver to the Holder a certificate or certificates representing the Warrant
Shares issuable upon such exercise, registered in the name of the Holder or its
designee. If this Warrant should be exercised in part only, the Company shall,
upon surrender of this Warrant for cancellation, execute and deliver a Warrant
evidencing the right of the Holder to purchase the balance of the aggregate
number of Warrant Shares purchasable hereunder as to which this Warrant has not
been exercised or assigned.

        SECTION 3 REGISTRATION OF TRANSFER AND EXCHANGE.

        Any Warrants issued upon the transfer or exercise in part of this
Warrant shall be numbered and shall be registered in a warrant register (the
"Warrant Register") as they are issued. The Company shall be entitled to treat
the registered holder of any Warrant on the Warrant Register as the owner in
fact thereof for all purposes, and shall not be bound to recognize any equitable
or other claim to, or interest in, such Warrant on the part of any other person,
and shall not be liable for any registration or transfer of Warrants which are
registered or to be registered in the name of a fiduciary or the nominee of a
fiduciary unless made with the actual knowledge that a fiduciary or nominee is
committing a breach of trust in requesting such registration of transfer, or
with the knowledge of such facts that its participation therein amounts to bad
faith. This Warrant shall be transferable on the books of the Company only upon
delivery thereof duly endorsed by the Holder or by his duly authorized attorney
or representative, or accompanied by proper evidence of succession, assignment,
or authority to transfer. In all cases of transfer by an attorney, executor,
administrator, guardian, or other legal representative, duly authenticated
evidence of his, her, or its authority shall be produced. Upon any registration
of transfer, the Company shall deliver a new Warrant or Warrants to the person
entitled thereto. This Warrant may be exchanged, at the option of the Holder
thereof, for another Warrant, or other Warrants of different denominations, of
like tenor and representing in the aggregate the right to purchase a like number
of Warrant Shares (or portions thereof), upon surrender to the Company or its
duly authorized agent. Notwithstanding the foregoing, the Company shall have


                                       2
<PAGE>   3



no obligation to cause Warrants to be transferred on its books to any person if,
in the opinion of counsel to the Company, such transfer does not comply with the
provisions of the Securities Act and the rules and regulations thereunder.

        SECTION 4 RESERVATION OF SHARES.

        The Company shall at all times reserve and keep available out of its
authorized and unissued Common Stock, solely for the purpose of providing for
the exercise of the Warrants, such number of shares of Common Stock as shall,
from time to time, be sufficient therefor. The Company represents that all
shares of Common Stock issuable upon exercise of this Warrant are duly
authorized and, upon receipt by the Company of the full payment for such Warrant
Shares, will be validly issued, fully paid, and nonassessable, without any
personal liability attaching to the ownership thereof and will not be issued in
violation of any preemptive or similar rights of shareholders.

        SECTION 5 ANTIDILUTION.

            (a) In the event that the Company shall at any time after the
Initial Exercise Date (i) declare a dividend on the outstanding Common Stock
payable in shares of its capital stock, (ii) subdivide the outstanding Common
Stock; (iii) combine the outstanding Common Stock into a smaller number of
shares; or (iv) issue any shares of its capital stock by reclassification of the
Common Stock (including any such reclassification in connection with a
consolidation or merger in which the Company is the continuing corporation),
then, in each case, the Exercise Price per Warrant Share in effect at the time
of the record date for the determination of shareholders entitled to receive
such dividend or distribution or of the effective date of such subdivision,
combination, or reclassification shall be adjusted so that it shall equal the
price determined by multiplying such Exercise Price by a fraction, the numerator
of which shall be the number of shares of Common Stock outstanding immediately
prior to such action, and the denominator of which shall be the number of shares
of Common Stock outstanding after giving effect to such action. Such adjustment
shall be made successively whenever any event listed above shall occur and shall
become effective at the close of business on such record date or at the close of
business on the date immediately preceding such effective date, as applicable.

            (b) All calculations under this Section 5 shall be made to the
nearest cent or to the nearest one-hundredth of a share, as the case may be.

            (c) In any case in which this Section 5 shall require that an
adjustment in the number of Warrant Shares be made effective as of a record date
for a specified event, the Company may elect to defer, until the occurrence of
such event, issuing to the Holder, if the Holder exercised this Warrant after
such record date, the Warrant Shares, if any, issuable upon such exercise over
and above the number of Warrant Shares issuable upon such exercise on the basis
of the number of shares of Common Stock in effect prior to such adjustment;
provided, however, that the Company shall deliver to the Holder a due bill or
other appropriate instrument evidencing the Holder's right to receive such
additional shares of Common Stock upon the occurrence of the event requiring
such adjustment.



                                       3
<PAGE>   4

            (d) Whenever there shall be an adjustment as provided in this
Section 5, the Company shall within 15 days thereafter cause written notice
thereof to be sent by registered mail, postage prepaid, to the Holder, at its
address as it shall appear in the Warrant Register, which notice shall be
accompanied by an officer's certificate setting forth the number of Warrant
Shares issuable and the Exercise Price thereof after such adjustment and setting
forth a brief statement of the facts requiring such adjustment and the
computation thereof, which officer's certificate shall be conclusive evidence of
the correctness of any such adjustment absent manifest error.

            (e) The Company shall not be required to issue fractions of shares
of Common Stock or other capital stock of the Company upon the exercise of this
Warrant. If any fraction of a share of Common Stock would be issuable on the
exercise of this Warrant (or specified portions thereof), the Company shall
purchase such fraction for an amount in cash equal to the same fraction of the
average closing sale price (or average of the closing bid and asked prices, if
closing sale price is not available) of Common Stock for the 10 trading days
ending on and including the date of exercise of this Warrant.

            (f) No adjustment in the Exercise Price per Warrant Share shall be
required if such adjustment is less than $0.25; provided, however, that any
adjustments which by reason of this Section 5 are not required to be made shall
be carried forward and taken into account in any subsequent adjustment.

            (g) Whenever the Exercise Price payable upon exercise of this
Warrant is adjusted pursuant to subsection (a) above, the number of Warrant
Shares issuable upon exercise of this Warrant shall simultaneously be adjusted
by multiplying the number of Warrant Shares theretofore issuable upon exercise
of this Warrant by the Exercise Price in effect on the date hereof and dividing
the product so obtained by the Exercise Price, as adjusted.

        SECTION 6 RECLASSIFICATION; REORGANIZATION; MERGER.

            (a) In case of any capital reorganization, other than in the cases
referred to in Section 5(a) hereof, or the consolidation or merger of the
Company with or into another corporation (other than a merger or consolidation
in which the Company is the continuing corporation and which does not result in
any reclassification of the outstanding shares of Common Stock or the conversion
of such outstanding shares of Common Stock into shares of other stock or other
securities or property), or in the case of any sale, lease, or conveyance to
another corporation of the property and assets of any nature of the Company as
an entirety or substantially as an entirety (such actions being hereinafter
collectively referred to as "Reorganizations"), there shall thereafter be
deliverable upon exercise of this Warrant (in lieu of the number of Warrant
Shares theretofore deliverable) the number of shares of stock or other
securities or property to which a holder of the respective number of Warrant
Shares which would otherwise have been deliverable upon the exercise of this
Warrant would have been entitled upon such Reorganization if this Warrant had
been exercised in full immediately prior to such Reorganization. In case of any
Reorganization, appropriate adjustment, as determined in good faith by the Board
of Directors of the Company, shall be made in the application of the provisions
herein set forth with respect to the rights and interests of the Holder so that
the provisions set forth herein shall thereafter be applicable, as nearly as
possible, in relation to any


                                       4
<PAGE>   5


shares or other property thereafter deliverable upon exercise of this Warrant.
Any such adjustment shall be made by, and set forth in, a supplemental agreement
between the Company, or any successor thereto, and the Holder, with respect to
this Warrant, and shall for all purposes hereof conclusively be deemed to be an
appropriate adjustment. The Company shall not effect any such Reorganization
unless, upon or prior to the consummation thereof, the successor corporation, or
if the Company shall be the surviving corporation in any such Reorganization and
is not the issuer of the shares of stock or other securities or property to be
delivered to holders of shares of the Common Stock outstanding at the effective
time thereof, then such issuer, shall assume by written instrument the
obligation to deliver to the Holder such shares of stock, securities, cash, or
other property as such Holder shall be entitled to purchase in accordance with
the foregoing provisions. In the event of sale, lease, or conveyance or other
transfer of all or substantially all of the assets of the Company as part of a
plan for liquidation of the Company, all rights to exercise this Warrant shall
terminate 30 days after the Company gives written notice to the Holder that such
sale or conveyance or other transfer has been consummated.

            (b) In case of any reclassification or change of the shares of
Common Stock issuable upon exercise of this Warrant (other than a change in par
value or from a specified par value to no par value, or as a result of a
subdivision or combination, but including any change in the shares into two or
more classes or series of shares), or in case of any consolidation or merger of
another corporation into the Company in which the Company is the continuing
corporation and in which there is a reclassification or change (including a
change to the right to receive cash or other property) of the shares of Common
Stock (other than a change in par value, or from no par value to a specified par
value, or as a result of a subdivision or combination, but including any change
in the shares into two or more classes or series of shares), the Holder or
holders of this Warrant shall have the right thereafter to receive upon exercise
of this Warrant solely the kind and amount of shares of stock and other
securities, property, cash, or any combination thereof receivable upon such
reclassification, change, consolidation, or merger by a holder of the number of
Warrant Shares for which this Warrant might have been exercised immediately
prior to such reclassification, change, consolidation, or merger. Thereafter,
appropriate provision shall be made for adjustments which shall be as nearly
equivalent as practicable to the adjustments in Section 5.

            (c) The above provisions of this Section 6 shall similarly apply to
successive reclassifications and changes of shares of Common Stock and to
successive consolidations, mergers, sales, leases, or conveyances.

        SECTION 7 NOTICE OF CERTAIN EVENTS.

        In case at any time the Company shall propose:

            (a) to pay any dividend or make any distribution on shares of Common
Stock in shares of Common Stock or make any other distribution (other than
regularly scheduled cash dividends which are not in a greater amount per share
than the most recent such cash dividend) to all holders of Common Stock; or


                                       5
<PAGE>   6

            (b) to issue any rights, warrants, or other securities to all
holders of Common Stock entitling them to purchase any additional shares of
Common Stock or any other rights, warrants, or other securities; or

            (c) to effect any reclassification or change of outstanding shares
of Common Stock or any consolidation, merger, sale, lease, or conveyance of
property, as described in Section 6; or

            (d) to effect any liquidation, dissolution, or winding-up of the
Company; or

            (e) to take any other action which would cause an adjustment to the
Exercise Price per Warrant Share;

then, and in any one or more of such cases, the Company shall give written
notice thereof by registered mail, postage prepaid, to the Holder at the
Holder's address as it shall appear in the Warrant Register, mailed at least 15
days prior to; (i) the date as of which the holders of record of shares of
Common Stock to be entitled to receive any such dividend, distribution, rights,
warrants, or other securities are to be determined; (ii) the date on which any
such reclassification, change of outstanding shares of Common Stock,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution, or winding-up is expected to become effective and the date as of
which it is expected that holders of record of shares of Common Stock shall be
entitled to exchange their shares for securities or other property, if any,
deliverable upon such reclassification, change of outstanding shares,
consolidation, merger, sale, lease, conveyance of property, liquidation,
dissolution, or winding-up; or (iii) the date of such action which would require
an adjustment to the Exercise Price per Warrant Share.

        SECTION 8 CHARGES AND TAXES

        The issuance of any shares or other securities upon the exercise of this
Warrant and the delivery of certificates or other instruments representing such
shares or other securities shall be made without charge to the Holder for any
tax or other charge in respect of such issuance. The Company shall not, however,
be required to pay any tax which may be payable in respect of any transfer
involved in the issue and delivery of any certificate in a name other than that
of the Holder and the Company shall not be required to issue or deliver any such
certificate unless and until the person or persons requesting the issue thereof
shall have paid to the Company the amount of such tax or shall have established
to the satisfaction of the Company that such tax has been paid.

        SECTION 9 PERIODIC REPORTS.

        The Company agrees that following the Initial Exercise Date and until
all the Warrant Shares shall have been sold pursuant to Rule 144 under the
Securities Act, it shall keep current in filing all reports, statements, and
other materials required to be filed with the Commission to permit holders of
the Warrant Shares to sell such securities under Rule 144 under the Securities
Act.


                                       6
<PAGE>   7

        SECTION 10 LEGEND.

        Until sold pursuant to the provisions of Rule 144 or otherwise
registered under the Securities Act, the Warrant Shares issued on exercise of
the Warrants shall be subject to a stop transfer order and the certificate or
certificates representing the Warrant Shares shall bear the following legend:

THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES
ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), OR ANY STATE SECURITIES LAWS AND
MAY NOT BE OFFERED, SOLD, PLEDGED, ASSIGNED, OR OTHERWISE TRANSFERRED UNLESS (1)
A REGISTRATION STATEMENT WITH RESPECT THERETO IS EFFECTIVE UNDER THE SECURITIES
ACT AND ANY APPLICABLE STATE SECURITIES LAWS, OR (2) THE COMPANY RECEIVES AN
OPINION OF COUNSEL TO THE HOLDER OF THE SECURITIES, WHICH COUNSEL AND OPINION
ARE REASONABLY SATISFACTORY TO THE COMPANY, THAT SUCH SECURITIES MAY BE OFFERED,
SOLD, PLEDGED, ASSIGNED, OR OTHERWISE TRANSFERRED IN THE MANNER CONTEMPLATED
WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER THE SECURITIES ACT OR
APPLICABLE STATE SECURITIES LAWS.

        SECTION 11 LOSS; THEFT; DESTRUCTION; MUTILATION.

        Upon receipt of evidence satisfactory to the Company of the loss, theft,
destruction, or mutilation of any Warrant (and upon surrender of any Warrant if
mutilated), and upon receipt by the Company of reasonably satisfactory
indemnification, the Company shall execute and deliver to the Holder thereof a
new Warrant of like date, tenor, and denomination.

        SECTION 12 SHAREHOLDER RIGHTS.

        The Holder of any Warrant shall not have, solely on account of such
status, any rights of a shareholder of the Company, either at law or in equity,
or to any notice of meetings of shareholders or of any other proceedings of the
Company, except as provided in this Warrant.

        SECTION 13 GOVERNING LAW.

        This Warrant shall be construed in accordance with the laws of the State
of California applicable to contracts made and performed within such State,
without regard to principles of conflicts of law.


                                       7
<PAGE>   8

        IN WITNESS WHEREOF, the Company has executed this Warrant as of the date
first above written.

                                      INTERSCIENCE COMPUTER CORPORATION


                                      By:
                                         ---------------------------------------
                                         Walter Kornblau
                                         President and Chief Executive Officer

[Seal]

----------------------------------
Secretary


                                       8
<PAGE>   9


                               FORM OF ASSIGNMENT

(To be executed by the registered holder if such holder desires to transfer the
attached Warrant.)

        FOR VALUE RECEIVED, ______________________ hereby sells, assigns, and
transfers unto _________________ a Warrant to purchase __________ shares of
Common Stock, without par value, of Interscience Computer Corporation, a
California corporation (the "Company"), and does hereby irrevocably constitute
and appoint ___________ attorney to transfer such Warrant on the books of the
Company, with full power of substitution.


Dated: _________________

                                            Signature __________________________


                                       9
<PAGE>   10


                                     NOTICE

        The signature on the foregoing Assignment must correspond to the name as
written upon the face of this Warrant in every particular, without alteration or
enlargement or any change whatsoever.


                                       10
<PAGE>   11

                              ELECTION TO EXERCISE

To:     Interscience Computer Corporation
        5236 Colodny Drive
        Agoura Hills, California 91301


        The undersigned hereby exercises his, her, or its rights to purchase
shares of Common Stock, without par value ("the Common Stock"), of Interscience
Computer Corporation, a California corporation (the "Company"), covered by the
within Warrant and tenders payment herewith in the amount of $_____ in
accordance with the terms thereof, and requests that certificates for the
securities constituting such shares of Common Stock be issued in the name of,
and delivered to:


     -----------------------------------------------------------------------
     (Print Name, Address, and Social Security or Tax Identification Number)

and, if such number of shares of Common Stock shall not constitute all such
shares of Common Stock covered by the within Warrant, that a new Warrant for the
balance of the shares of Common Stock covered by the within Warrant shall be
registered in the name of, and delivered to, the undersigned at the address
stated below.



Dated: __________________                   Name _______________________________
                                                          (Print)



Address:

_________________________

_________________________

                                            ____________________________________
                                                   (Signature)


                                       11