Document:

STOCK ACQUISITION AGREEMENT

                  AGREEMENT dated October 23, 2000, between Aggressive  American
Capital Partners, Inc., a Nevada corporation, (hereinafter collectively referred
to as the  "Buyer")  and  Benjamin  Traub,  on his own  behalf  and as agent for
certain principals, (hereinafter, the "Seller").

                  WHEREAS  this  Agreement  sets forth the terms and  conditions
upon  which  the  Seller  is today  selling  to  Buyer,  and the  Buyer is today
purchasing from the Seller 7,985,000 post reverse split  "restricted"  shares of
common stock (the  "Shares")  of Immulabs  Corporation,  a Colorado  corporation
("Company"),  $0.001 par value per share,  which represent  approximately 84% of
the issued and outstanding shares of capital stock of the Company .

                  In consideration of the mutual agreement contained herein, the
parties hereby agree as follows:

         I.  SALES OF THE SHARES.

                  1.01 Shares being Sold. Subject to the terms and conditions of
this Agreement,  the Seller is selling and delivering the Shares to the Buyer at
the  closing  (the  "Closing"),  free  and  clear  of  all  liens,  charges,  or
encumbrances of whatsoever nature.

                  1.02   Consideration.   Buyer  is  delivering  to  the  Seller
US$67,894.63  ("Consideration") which will be provided via certified check, bank
draft,  or wire transfer.  1.03 Closing.  Closing shall conclude when,  firstly,
Buyer has fully paid to Seller the Consideration and Seller forthwith thereafter
confirms receipt in writing, and secondly, the Shares are delivered by Seller on
Buyer's  instruction,  which shall all take place by October 23,  2000,  or such
other later date as to which the parties may reasonably agree if necessary.

                            II. RELATED TRANSACTIONS.

                  2.01  Finder.  There  are  no  finders  with  respect  to  the
transaction contemplated herein.

III.  REPRESENTATIONS AND WARRANTIES BY THE SELLER.

                  The Seller represents and warrants as follows:

                  3.01     Organization, Capitalization, etc.

                  (a) The  Company  is a  corporation  duly  organized,  validly
         existing, and in good standing under the laws of the state of Colorado,
         and is qualified to transact business in no other state.

                  (b) The  authorized  capital stock of the Company  consists of
         300,000,000 shares, $0.001 par value per share. All of the shares to be
         sold by Seller are owned free and clear of any liens, claims,  options,
         charges,  restrictions,  or  encumbrances  of whatsoever  nature.  Upon
         consummation of the  transactions  contemplated by this Agreement,  the
         Buyer will acquire  good and valid title to the Shares,  free and clear
         of all liens, claims, options, charges,  restrictions, and encumbrances
         of  whatsoever  nature.  The  Shares  being  acquired  by the Buyer are
         "restricted  securities"  as that  term is  defined  in Rule 144 of the
         Securities  Act of 1933 (the  "Act") and will  contain  an  appropriate
         legend as to the foregoing.  There are no outstanding  options or other
         agreements of any nature whatsoever relating to the Shares.

                  (c) The Seller has obtained any authority necessary to conduct
         this transaction.

                                       1

<PAGE>

                  3.02 No Violation.  Neither the execution and delivery of this
Agreement nor the  consummation  of the  transactions  contemplated  hereby will
constitute a violation or default under any term or provision of the Certificate
of Incorporation or Bylaws of the Company.

                  3.03  Financial  Statement.  The Seller has  delivered  to the
Buyer all financial statements (audited and unaudited) that have been filed with
the United States Securities and Exchange Commission.

                  3.04 Tax  Returns.  The Seller  warrants  the Company has duly
filed all tax reports and returns  required to be filed by it and has fully paid
all taxes and other  charges  claimed to be due from it by  federal,  state,  or
local taxing  authorities  (including without limitation those due in respect of
its properties, income, franchises, licenses, sales, and payrolls); there are no
liens  upon any of the  Company's  property  or  assets;  there  are not now any
pending  questions  relating to, or claims  asserted for,  taxes or  assessments
asserted against the Company.

                  3.05 Title to Properties;  Encumbrances.  The Seller  warrants
the Company owns no property, either real or personal.

                  3.06 Accounts Receivable. The Seller warrants the Company owns
no accounts receivable.

                  3.07 Minutes.  The Seller  warrants all minutes are up to date
and documented.

                  3.08  Liabilities.  The Seller  warrants  the  Company  has no
liabilities.

                  3.09 Absence of Certain  Changes.  The Seller  represents that
the Company has not since  inception  committed any of the following acts except
as disclosed in filings made with the Securities and Exchange Commission:

                  (a)  Suffered  any  material   adverse   change  in  financial
         condition, assets, liabilities, business, or prospects;

                  (b) Incurred any  obligation or liability  (whether  absolute,
         accrued, contingent, or otherwise) other than in the ordinary course of
         business and consistent with past practice;

                  (c) Paid any  claim or  discharged  or  satisfied  any lien or
         encumbrance  or paid or  satisfied  any  liability  (whether  absolute,
         accrued,  contingent,  or otherwise)  other than  liabilities  shown or
         reflected in the Company's financial statements, in the ordinary course
         of business and consistent with past practices;

                  (d)  Permitted  or  allowed  any of its  assets,  tangible  or
         intangible,  to be  mortgaged,  pledged,  or  subjected to any liens or
         encumbrances;

                  (e) Written down the value of any inventory or  written-off as
         uncollectible any notes or accounts receivable or any portion thereof;

                  (f)  Cancelled  any other debts or claims or waived any rights
         of  substantial  value,  or sold or  transferred  any of its  assets or
         properties,  tangible or  intangible,  other than sales of inventory or
         merchandise made in the ordinary course of business and consistent with
         past practice;

                  (g) Made any capital expenditures or commitments for additions
         to property,  plant or equipment;

                  (h)   Declared,   paid,  or  set  aside  for  payment  to  its
         stockholders  any  dividend  or other  distribution  in  respect of its
         capital stock or redeemed or purchased or otherwise acquired any of its
         capital  stock or any  options  relating  thereto or agreed to take any
         such action;

                  (i) Made any material  change in any method of  accounting  or
         accounting practice.

                                       2

<PAGE>

                  3.10  Litigation.  There  are  no  actions,   proceedings,  or
investigations  pending or, to the knowledge of the Seller,  threatened  against
the  Company  by any party,  and the Seller  does not know or have any reason to
know of any basis for any such action, proceeding, or investigation. There is no
event or condition of any kind or character pertaining to the business,  assets,
or  prospects  of the Company  that may  materially  and  adversely  affect such
business, assets or prospects.

                  3.11  Disclosure.  The Seller has  disclosed  to the Buyer all
facts  material to the  assets,  prospects,  and  business  of the  Company.  No
representation  or warranty by the Seller  contained in this  Agreement,  and no
statement contained in any instrument,  list, certificate,  or writing furnished
to the  Buyer  pursuant  to the  provisions  hereof  or in  connection  with the
transaction  contemplated  hereby,  contains any untrue  statement of a material
fact or omits to state a material fact necessary in order to make the statements
contained  herein or therein not  misleading  or necessary in order to provide a
prospective  purchaser of the Shares with proper  information  as to the Company
and its affairs.

                  3.12  SEC  Filings.   The  Company   files  reports  with  the
Securities and Exchange Commission (hereinafter the "SEC") and is current in all
respects with its  reporting  obligations,  including,  but not limited to those
required by Section 16(a) of the Securities  Exchange Act of 1934 (the "Exchange
Act"). There are no outstanding issues with the SEC or the NASD.

                  3.13 Bulletin  Board  Listing.  The Company's  common stock is
currently  traded on the Bulletin Board operated by the National  Association of
Securities  Dealers,  Inc. (the "Bulletin  Board") under the symbol "IMLB".  The
common  stock will be trading on the  Bulletin  Board at Closing  and the Seller
warrants that this  transaction  will not cause the shares of common stock to be
delisted from the Bulletin Board and the Seller will take all steps necessary to
assure that the Company's common stock will continue to trade thereon.

                IV. REPRESENTATIONS AND WARRANTIES BY THE BUYER.

                  The Buyer hereby represents and warrants as follows:

                  4.01 Organization, etc. The Buyer is has full authority to act
on its behalf.

                  4.02  Authority.  The execution and delivery of this Agreement
by the Buyer and the consummation by the Buyer of the transactions  contemplated
hereby have been duly authorized by the Buyer.

                  4.03 Representations Regarding the Acquisition of the Shares.

                  (a) The  Buyer  understands  that  the  SHARES  HAVE  NOT BEEN
         APPROVED OR  DISAPPROVED  BY THE UNITED STATES  SECURITIES AND EXCHANGE
         COMMISSION OR ANY STATE  SECURITIES  AGENCIES;

                  (b) The  Buyer  is not an  underwriter  and is  acquiring  the
         Seller's Shares solely for investment for the account of the Buyers and
         not with a view to, or for, resale in connection with any  distribution
         with in the meaning of the federal securities act, the state securities
         acts or any other applicable state securities acts;

                  (c) The Buyer understands the speculative  nature and risks of
         investments  associated  with the Company and confirms  that the Shares
         are suitable and consistent with his or her investment program and that
         his or her financial  position  enables him or her to bear the risks of
         this  investment;  and that there may not be any public  market for the
         Shares subscribed for herein;

                  (d) The Shares  subscribed for herein may not be  transferred,
         encumbered, sold, hypothecated, or otherwise disposed of to any person,
         without the express prior written  consent of the Company and the prior
         opinion of  counsel  for the  Company  that such  disposition  will not
         violate  federal  and/or  state  securities  acts.   Disposition  shall
         include,   but  is  not   limited  to  acts  of   selling,   assigning,
         transferring,  pledging,  encumbering,  hypothecating,  gibing, and any
         form of conveying, whether voluntary or not;

                                       3

<PAGE>

                  (e) To the extent that any federal,  and/or  state  securities
         laws shall  require,  the Buyer hereby agrees that any Shares  acquired
         pursuant to this Agreement shall be without preference as to assets;

                  (f) The Company is under no  obligation to register or seek an
         exemption under any federal and/or state  securities acts for any stock
         of the  Company or to cause or permit such stock to be  transferred  in
         the absence of any such  registration  or exemption  and that the Buyer
         herein  must  hold  such  stock  indefinitely   unless  such  stock  is
         subsequently  registered under any federal and/or state securities acts
         or an exemption from registration is available;

                  (g) The Buyer represents that it is sophisticated  and has had
         the opportunity to ask questions of the Company and receive  additional
         information  from the Company to the extent that the Company  possessed
         such information,  or could acquire it without  unreasonable  effort or
         expense necessary to evaluate the merits and risks of any investment in
         the Company.

                  (h) The Buyer has satisfied the suitability  standards imposed
         by the laws of  his/hers/its  domicile.  The Shares being acquired from
         the Company have not been  registered  under federal,  state or foreign
         laws.

                V. SURVIVAL OF REPRESENTATIONS; INDEMNIFICATION.

                  5.01  Survival  of   Representations.   All   representations,
warranties,  and  agreements  made by any party in this  Agreement  or  pursuant
hereto shall survive the execution and delivery hereof and any  investigation at
any time made by or on behalf of any party.

                  5.02  Indemnification.  The  Seller,  jointly  and  severally,
agrees to  indemnify  the Buyer and hold it harmless  from and in respect of any
assessment,  loss,  damage,  liability,  cost,  and expense  (including  without
limitation  interest,  penalties,  and reasonable  attorneys' fees) in excess of
$100 in the  aggregate,  imposed upon or incurred by the Buyer  resulting from a
breach of any agreement,  representation,  or warranty of the Company. Assertion
by the Buyer of their right to indemnification under this Section 5.02 shall not
preclude  the  assertion  by the Buyer of any other rights or the seeking of any
other remedies against the Seller.

                               VI. MISCELLANEOUS.

                  6.01 Expenses. All fees and expenses incurred by the Seller in
connection with the  transactions  contemplated by this Agreement shall be borne
by the respective parties hereto.

                  6.02  Further  Assurances.  From time to time,  at the Buyer's
request and without further consideration,  the Seller, at its own expense, will
execute and transfer  such  documents and will take such action as the Buyer may
reasonably  request in order to effectively  consummate the transactions  herein
contemplated.

                  6.03 Parties in Interest. All the terms and provisions of this
Agreement  shall be binding  upon,  shall  inure to the benefit of, and shall be
enforceable   by  the   prospective   heirs,   beneficiaries,   representatives,
successors, and assigns of the parties hereto.

                                       4
<PAGE>

                  6.04 - 6.05 omitted

                  6.06 Prior Agreements;  Amendments.  This Agreement supersedes
all prior agreements and understandings  between the parties with respect to the
subject  matter  hereof.  This  Agreement  may  be  amended  only  by a  written
instrument duly executed by the parties hereto or their respective successors or
assigns.  6.07  Documents.  Within 10 days of execution of this  Agreement,  all
files, documents,  agreements,  minutes and all other paperwork or documentation
of every  kind  related  to the  Company  which the  Seller  possesses  shall be
delivered to the Buyer in an organized and up-to-date industry standard format.

                  6.08 Headings. The section and paragraph headings contained in
this  Agreement are for reference  purposes only and shall not affect in any way
the meaning or interpretations of this Agreement.

                  6.09 Governing  Law. This  Agreement  shall be governed by and
construed  and  enforced in  accordance  with the laws of the state of Colorado,
without regard to its  conflict-of-laws  rules and venue of any actions  brought
under this Agreement will be in the federal or state courts of Colorado.

                  6.10  Notices.  All  notices,  requests,  demands,  and  other
communications  hereunder  shall be in writing  and shall be deemed to have been
duly  given if  delivered  or mailed  (registered  or  certified  mail,  postage
prepaid,  return  receipt  requested)  to the  address  advised by each party in
writing.

                  6.11  Effect.  In the event any portion of this  Agreement  is
deemed to be null and void under any state or federal  law,  all other  portions
and provisions not deemed void or voidable shall be given full force and effect.

                  6.12   Counterparts.    This   Agreement   may   be   executed
simultaneously  in  several  counterparts,  each of  which  shall be  deemed  an
original,  but  all  of  which  together  shall  constitute  one  and  the  same
instrument.

                 [BALANCE OF THIS PAGE LEFT BLANK INTENTIONALLY]

                                       5
<PAGE>

                  6.13  Acceptance by Facsimile:  The parties agree that receipt
of a fully executed copy of this Agreement via facsimile  transmission  shall be
binding  and may be used as  admissible  evidence  that the  party  transmitting
intends to be bound by the terms set forth herein.

                  IN WITNESS WHEREOF,  this Agreement has been duly executed and
delivered by the Seller and Buyer, as of the date first above written.

                                    BUYER:

-----------------------------
Witness

                                    --------------------------------------------
                                    Aggressive American Capital Partners Inc. by
                                    Its authorized signatory

                                    SELLER:

-----------------------------
Witness

                                    --------------------------------------------
                                    Benjamin Traub, on his own behalf and as
                                    authorized agent for certain principals

                                       6<PAGE>
                                                                   EXHIBIT 4.1

                       Marshall Capital Management, Inc.
                               11 Madison Avenue
                           New York, New York 10010

                               October 31, 2000

Pilot Network Services, Inc.
1080 Marina Village Parkway
Alameda, California 94501
Attn:  Marketta Silvera

             Re:    Series A Convertible Preferred Stock (the "Preferred Stock")
                    ------------------------------------------------------------
Dear Sirs:

     This letter confirms the agreement between Pilot Network Services, Inc.
(the "Company") and Marshall Capital Management, Inc. ("MCM"), as follows:

     1.        MCM agrees to waive the Company's failure to hold its annual
meeting of stockholders not later than October 1, 2000 pursuant to paragraph
4.12 of the Securities Purchase Agreement, dated as of June 28, 2000, between
the Company and MCM (the "Purchase Agreement"); provided, that, as a condition
to such waiver, the Company will use its best efforts to hold such meeting no
later than December 31, 2000.  The foregoing waiver shall not operate as a
waiver of any other right or remedy available to MCM with respect to any other
breach by the Company of the Purchase Agreement, the related Certificate of
Designation or any document executed by the Company in connection therewith.

     2.        In consideration of the waiver described in paragraph 1 above,
the Company and MCM agree to amend the Registration Rights Agreement (as defined
in the Purchase Agreement) to add the following paragraph at the end of
paragraph 2(e) thereof:

     "(f)      In the event that the Registration Statement is not declared
effective by October 31, 2000, the Purchaser shall have the right (the "Exchange
Right"), from time to time beginning on the date hereof until the Maturity Date,
to exchange Preferred Shares for shares of Common Stock (the "Exchange Shares")
at an exchange rate of 637.958 Exchange Shares for each Preferred Share tendered
for exchange (the "Exchange Rate"), such rate having been determined by
reference to an assumed Conversion Price of $1.5675; provided, however, that in
                                                     --------  -------
no event shall the Company issue pursuant to the Exchange Right a number of
Exchange Shares which is, in the aggregate, greater than the lesser of (x)
1,512,579 shares of Common Stock (representing 9.99% of the total number of
shares of Common Stock outstanding on the date of this letter) and (y) that
number of shares of Common Stock which, when added to the number of shares, if
any, that have been issued to MCM and that are included in determining the Cap
Amount (as defined in the Certificate of Designation), would exceed the Cap
Amount, except that this clause (y)
<PAGE>

shall not apply on the Maturity Date if the Company obtains the approval of the
holders of a majority of the Company's outstanding Common Stock for the issuance
of Common Stock in excess of the Cap Amount and elects a Conversion at Maturity
pursuant to Section 4(g)(ii) of the Certificate of Designation. Upon delivery of
a written notice to the Company by the Purchaser stating that the Purchaser
wishes to exercise the Exchange Right (an "Exchange Notice"), the Purchaser and
the Company shall follow the procedures set forth in the Certificate of
Designation that apply to the conversion of Preferred Shares, with such changes
as may be appropriate in order to reflect the intent of this paragraph (f), and
delivery of an Exchange Notice shall be deemed to constitute delivery of a
Conversion Notice for purposes of compliance with such procedures. The Company
represents and warrants to, and agrees with, the Purchaser that: (i) its
obligation to exchange Exchange Shares for Preferred Shares on the terms and
subject to the conditions set forth herein is enforceable against it in
accordance with the terms of this paragraph (f), such obligation does not
conflict with any other obligation of the Company, and such obligation is
absolute and unconditional, regardless of any resulting dilution of the
outstanding shares of Common Stock, or otherwise, (ii) all Exchange Shares shall
be deemed to be included within the definition of Registrable Securities for all
purposes under this Agreement, (iii) the failure by the Company to issue
Exchange Shares within three (3) business days following the tender of Preferred
Shares for exchange by the Purchaser to the Company shall be deemed to
constitute a failure to deliver Conversion Shares in accordance with the
Certificate of Designation, and in such event the Purchaser shall have all of
the rights and remedies available to it under the Certificate of Designation and
otherwise as though a Conversion Default had occurred, except that references to
the "Conversion Price" shall be deemed to refer to the Conversion Price used to
determine the Exchange Rate, and (iv) there are 15,138,072 shares of Common
Stock outstanding on the date of this letter. The Company and the Purchaser
acknowledge and agree that, for the purpose of calculating the Cap Amount under
the Certificate of Designation, any Exchange Shares issued pursuant to the
Exchange Right shall be included in such calculation. All prices per share or
share amounts set forth herein shall be subject to adjustment in the event of
stock splits, reverse stock splits, stock dividends and similar events."

     Except as specifically amended hereby, the Registration Rights Agreement
shall continue in full force and effect in accordance with its terms.

     3.        The Company will indemnify and hold harmless MCM from and against
any claims, liabilities, damages and expenses (including reasonable legal fees
and expenses) arising out of the transactions contemplated by this letter.

     4.        The terms of this letter shall be binding on the parties and
their respective successors and assigns.  Accordingly (i) MCM agrees that, as a
precondition to any sale or other transfer by it of Preferred Shares, it will
obtain from the transferee thereof its written agreement to be bound by the
terms of this letter agreement and (ii) the Company agrees that as a
precondition to any merger, consolidation, business combination, tender offer,
sale or exchange of shares or assets, recapitalization, reorganization,
redemption or other similar event as a result of which shares of Common Stock
shall be changed into or exchanged for securities of another entity, the Company
will obtain the written agreement
<PAGE>

of the resulting successor or acquiring entity to assume the obligations of the
Company hereunder. The Company may, upon its request, place a legend on the
Preferred Shares which refers to this Agreement.

     If this letter correctly sets forth the understanding between the Company
and MCM, please sign below in the space indicated whereupon this letter will
constitute a legally-binding agreement between the parties.

                                  Sincerely,

                                  Marshall Capital Management, Inc.

                                  By: /s/ Allan D. Weine
                                      ------------------
                                          Allan D. Weine
                                          President

Acknowledged and Agreed:

Pilot Network Services, Inc.

By: /s/ Marketta Silvera
    --------------------
    Name:  Marketta Silvera
    Title:  Chief Executive Officer

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00016-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00016-of-00352.parquet"}]]