Document:

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EXHIBIT 4.1

                                WARRANT AGREEMENT

                  WARRANT AGREEMENT (the "Warrant Agreement" or this
"Agreement") dated as of December 15, 2004 between Advanced Technology
Industries, Inc., a Delaware corporation ("Parent"), and LTDnetwork, Inc., a
Delaware corporation (the "Company").

                  WHEREAS, Parent, the Company and LTDN Acquisition Corp., a
Delaware corporation ("Acquisition"), have entered into an Amended and Restated
Agreement and Plan of Merger dated as of August 11, 2004 (the "Merger
Agreement") which provides for the merger (the "Merger") of the Company with and
into Acquisition;

                  WHEREAS, in connection with the Merger, Parent intends to
issue to the stockholders of the Company shares of series A convertible
preferred stock, par value $0.001, of Parent (the "Parent Convertible Preferred
Stock") and warrants (the "Warrants") to purchase, prior to the Conversion (as
hereinafter defined), shares of Parent Convertible Preferred Stock and,
following the Conversion, shares of common stock, par value $0.001, of Parent
(the "Common Stock"); and

                  WHEREAS, the shares of Parent Convertible Preferred Stock will
be converted (the "Conversion") into shares of Common Stock if the stockholders
of Parent approve an amendment to Parent's Certificate of Incorporation to
increase the authorized capital stock of Parent in an amount sufficient such
that (i) all outstanding shares of Parent Convertible Preferred Stock can be
converted into shares of Common Stock and (ii) following the Conversion, each
outstanding Warrant can be exercised to purchase such number of shares of Common
Stock subject to such Warrants.

                  NOW, THEREFORE, in consideration of the foregoing and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

                  SECTION 1. DEFINITIONS. Capitalized terms used herein without
definition shall have the meanings ascribed to them in the Merger Agreement. As
used in this Agreement, the following defined terms shall have the following
meanings:

                  "Common Exercise Price" means $.040830923 per share of Common
Stock as such price may be adjusted pursuant to Section 11.

                  "Exercise Period" means the period commencing on the date the
Merger is consummated and terminating (i) with respect to 25% of the aggregate
Warrants under this Agreement, at 5:00 p.m. on May 15, 2005, (ii) with respect
to 25% of the aggregate Warrants under this Agreement, at 5:00 p.m. on June 15,
2005, (iii) with respect to 25% of the aggregate Warrants under this Agreement,
at 5:00 p.m. on July 15, 2005 and (iv) with respect to 25% of the aggregate
Warrants under this Agreement, at 5:00 p.m. on August 15, 2005.

                      "Exercise Price" means (a) prior to the Conversion, the
Preferred Exercise Price and (b) after the Conversion, the Common Exercise
Price.

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                  "Holder" means the registered holder of a Warrant Certificate.

                  "Preferred Exercise Price" means $16.33236928 per share of
Parent Convertible Preferred Stock as such price may be adjusted pursuant to
Section 11.

                  "Warrant Shares" means the Parent Convertible Preferred Stock,
Common Stock or other securities issued or issuable, as the case may be, from
time upon exercise of the Warrants.

                  SECTION 2. WARRANT CERTIFICATES. The certificates evidencing
the Warrants (the "Warrant Certificates") to be delivered pursuant to this
Agreement shall be in registered form only and shall be substantially in the
form set forth in Exhibit A attached hereto. With respect to the initial
issuance of Warrants in connection with the Merger, Holders shall receive a (a)
Warrant Certificate representing Warrants to be issued to such Holder with
respect to the 25% of the aggregate Warrants terminating on May 15, 2005, (b)
Warrant Certificate representing Warrants to be issued to such Holder with
respect to the 25% of the aggregate Warrants terminating on June 15, 2005, (c)
Warrant Certificate representing Warrants to be issued to such Holder with
respect to the 25% of the aggregate Warrants terminating on July 15, 2005 and
(d) Warrant Certificate representing Warrants to be issued to such Holder with
respect to the 25% of the aggregate Warrants terminating on August 15, 2005.

                  SECTION 3. EXECUTION OF WARRANT CERTIFICATES. Warrant
Certificates shall be signed on behalf of Parent by its Chairman of the Board or
its Chief Executive Officer or its President or its Chief Operating Officer or
its Chief Financial Officer or a Vice President and by its Secretary or an
Assistant Secretary. Each such signature upon the Warrant Certificates may be in
the form of a facsimile signature of the present or any future Chairman of the
Board, Chief Executive Officer, President, Chief Operating Officer, Chief
Financial Officer, Vice President, Secretary or Assistant Secretary and may be
imprinted or otherwise reproduced on the Warrant Certificates and for that
purpose Parent may adopt and use the facsimile signature of any person who shall
have been Chairman of the Board, Chief Executive Officer, President, Chief
Operating Officer, Chief Financial Officer, Vice President, Secretary or
Assistant Secretary, notwithstanding the fact that at the time the Warrant
Certificates shall be delivered or disposed of such person shall have ceased to
hold such office.

                  In case any officer of Parent who shall have signed any of the
Warrant Certificates shall cease to be such officer before the Warrant
Certificates so signed shall have been disposed of by Parent, such Warrant
Certificates nevertheless may be delivered or disposed of as though such person
had not ceased to be such officer of Parent; and any Warrant Certificate may be
signed on behalf of Parent by any person who, at the actual date of the
execution of such Warrant Certificate, shall be a proper officer of Parent to
sign such Warrant Certificate, although at the date of the execution of this
Warrant Agreement any such person was not such an officer.

                  SECTION 4. REGISTRATION. Parent shall number and register the
Warrant Certificates in a register as they are issued. Parent may deem and treat
the registered Holder(s) of the Warrant Certificates as the absolute owner(s)
thereof (notwithstanding any notation of ownership or other writing thereon made
by anyone), for all purposes, and shall not be affected by any notice to the
contrary. Parent shall act as the registrar for the Warrants.

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                  SECTION 5. REGISTRATION OF TRANSFERS AND EXCHANGES. (a) Parent
shall from time to time register the transfer of any outstanding Warrant
Certificates in a Warrant register to be maintained by Parent upon surrender
thereof accompanied by the Assignment Form on the reverse of the Warrant
Certificate, duly executed by the registered Holder or Holders thereof or by the
duly appointed legal representative thereof or by a duly authorized attorney
together with such legal opinions, certificates or other information required by
such Assignment Form. Upon any such registration of transfer, a new Warrant
Certificate shall be issued to the transferee(s) and the surrendered Warrant
Certificate shall be canceled and disposed of by Parent.

                  (b) Each Warrant Certificate will bear the following legend:

                           "THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE U.S.
          SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND,
          ACCORDINGLY, MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE
          TRANSFERRED IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH
          TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, SUCH REGISTRATION.

                  (c) Each Holder of a Warrant Certificate, by accepting the
same, consents and agrees with Parent and with each subsequent holder of such
Warrant Certificate that, prior to due presentment of such Warrant Certificate
for registration of transfer, Parent may treat the person in whose name the
Warrant Certificate is registered as the owner thereof for all purposes and as
the person entitled to exercise the rights granted under the Warrants, and
neither Parent nor any agent thereof shall be affected by any notice to the
contrary.

                  SECTION 6. WARRANTS; EXERCISE OF WARRANTS. Subject to the
terms of this Agreement, each Warrant shall give the Holder thereof the right,
which may be exercised during the applicable period of the Exercise Period, upon
payment of the Exercise Price, to receive from Parent (a) prior to the
Conversion, one fully paid and nonassessable share of Parent Convertible
Preferred Stock and (b) after the Conversion, 400 fully paid and nonassessable
shares of Common Stock, subject in the case of clause (a) and (b) to adjustment
pursuant to Section 11 hereof, provided, however, that Holders will be able to
exercise their Warrants only if the exercise of such Warrants is exempt from the
registration requirements of the Securities Act (and Parent has received such
information as Parent may reasonably request to confirm that such transfer is
being made pursuant to an exemption from, or in a transaction not subject to,
the registration requirements of the Securities Act). Each Warrant not exercised
during the applicable period of the Exercise Period, upon payment of the
Exercise Price, shall become void and all rights thereunder and all rights in
respect thereof under this Agreement shall cease as of such time.

                  A Warrant may be exercised upon surrender to Parent at its
office designated for such purpose (the address of which is set forth in Section
14 hereof) of the Warrant Certificate or Certificates evidencing the Warrants to
be exercised with the form of election to purchase on the reverse thereof duly
filled in and signed, which signature shall be guaranteed by a bank or trust
company having an office or correspondent in the United States or a broker or
dealer which is a member of a registered securities exchange or the National
Association of Securities Dealers, Inc., and upon payment to Parent of the
Exercise Price, for the number of Warrant Shares in respect of which such
Warrants are then exercised. Payment of the aggregate Exercise Price shall be
made in cash or by certified or official bank check to the order of Parent.

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                  Subject to the provisions of Section 7 hereof, upon such
surrender of Warrant Certificates and payment of the Exercise Price, Parent
shall issue and cause to be delivered with all reasonable dispatch to or upon
the written order of the Holder and in such name or names as the Holder may
designate, a certificate or certificates for the number of full Warrant Shares
issuable upon the exercise of such Warrants. Such certificates shall contain a
legend substantially similar to the legend set forth in Section 5(b).

                  Prior to the exercise of the Warrants, except as may be
specifically provided for herein, (i) no Holder of a Warrant Certificate, as
such, shall be entitled to any of the rights of a holder of Parent Convertible
Preferred Stock or Common Stock, including, without limitation, the right to
vote at or to receive any notice of any meetings of stockholders; (ii) the
consent of any such Holder shall not be required with respect to any action or
proceeding of Parent; (iii) no such Holder, by reason of the ownership or
possession of a Warrant or the Warrant Certificate representing the same, shall
have any right to receive any cash dividends, stock dividends, allotments or
rights or other distributions paid, allotted or distributed or distributable to
the stockholders of Parent prior to, or for which the relevant record date
preceded, the date of the exercise of such Warrant; and (iv) no such Holder
shall have any right not expressly conferred by the Warrant or Warrant
Certificate held by such Holder.

                  In the event that a Warrant Certificate is exercised in
respect of fewer than all of the Warrant Shares issuable on such exercise at any
time prior to the date of expiration of the Warrants, a new Warrant Certificate
evidencing the remaining Warrant or Warrants will be issued and delivered
pursuant to the provisions of this Section and of Section 4 hereof.

                  All Warrant Certificates surrendered upon exercise of Warrants
shall be canceled by Parent.

                  SECTION 7. PAYMENT OF TAXES. Parent will pay all documentary
stamp taxes attributable to the initial issuance of Warrant Shares upon the
exercise of Warrants; PROVIDED, HOWEVER, that Parent shall not be required to
pay any tax or taxes which may be payable in respect of any transfer involved in
the issue of any Warrant Certificates or any certificates for Warrant Shares in
a name other than that of the registered Holder of a Warrant Certificate
surrendered for registration of transfer or upon the exercise of a Warrant, and
Parent shall not be required to issue or deliver such Warrant Certificates
unless or until the person or persons requesting the issuance thereof shall have
paid to Parent the amount of such tax or shall have established to the
reasonable satisfaction of Parent that such tax has been paid.

                  SECTION 8. MUTILATED OR MISSING WARRANT CERTIFICATES. In case
any of the Warrant Certificates shall be mutilated, lost, stolen or destroyed,
Parent may in its discretion issue, in exchange and substitution for and upon
cancellation of the mutilated Warrant Certificate, or in lieu of and
substitution for the Warrant Certificate lost, stolen or destroyed, a new
Warrant Certificate of like tenor and representing an equivalent number of
Warrants, but only upon receipt of evidence reasonably satisfactory to Parent of
such loss, theft or destruction of such Warrant Certificate and indemnity, if
requested, also reasonably satisfactory to it. Applicants for such substitute
Warrant Certificates shall also comply with such other reasonable regulations
and pay such other reasonable charges as Parent may prescribe.

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                  SECTION 9. RESERVATION OF WARRANT SHARES. Parent will at all
times reserve and keep available, free from preemptive rights, out of the
aggregate of its authorized but unissued Parent Convertible Preferred Stock and,
after the Conversion, Common Stock or its authorized and issued Parent
Convertible Preferred Stock and, after the Conversion, Common Stock held in its
treasury, for the purpose of enabling it to satisfy any obligation to issue
Warrant Shares upon exercise of Warrants, the maximum number of shares of Parent
Convertible Preferred Stock and, after the Conversion, Common Stock which may
then be deliverable upon the exercise of all outstanding Warrants.

                  Parent represents and warrants that the initial Warrant Shares
issuable upon conversion of Warrants have been duly authorized and covenants
that all Warrant Shares which may be issued upon exercise of Warrants will, upon
issue, be fully paid, nonassessable, free of preemptive rights and, subject to
Section 7, free from all taxes, liens, charges and security interests with
respect to the issue thereof.

                  SECTION 10. REGISTRATION RIGHTS AGREEMENT. The shares of
Common Stock and Parent Convertible Preferred Stock issued upon exercise of a
Warrant shall be entitled to the benefits of the Registration Rights Agreement
dated the date hereof between Parent and the Company.

                  SECTION 11. ADJUSTMENT OF NUMBER OF WARRANT SHARES ISSUABLE.
The number of Warrant Shares issuable upon the exercise of each Warrant are
subject to adjustment from time to time upon the occurrence of the events
enumerated in this Section 11.

                  (a) Adjustment for change in Parent Convertible Preferred
Stock.

                  If Parent:

                  (1) pays a dividend or makes a distribution on its Parent
         Convertible Preferred Stock in shares of its Parent Convertible
         Preferred Stock;

                  (2) subdivides its outstanding shares of Parent Convertible
         Preferred Stock into a greater number of shares; or

                  (3) combines its outstanding shares of Parent Convertible
         Preferred Stock into a smaller number of shares;

then the number of shares of Parent Convertible Preferred Stock issuable upon
exercise of any Warrant in effect immediately prior to such action shall be
proportionately adjusted so that the Holder of any Warrant thereafter exercised
may receive the aggregate number of shares of Parent Convertible Preferred Stock
which such Holder would have owned immediately following such action if such
Warrant had been exercised immediately prior to such action.

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                  The adjustment shall become effective immediately after the
record date in the case of a dividend or distribution and immediately after the
effective date in the case of a subdivision, combination or reclassification.

                  Such adjustment shall be made successively whenever any event
listed above shall occur.

                  (b) Adjustment for change in Common Stock.

                  If Parent:

                  (1) pays a dividend or makes a distribution on its Common
         Stock in shares of its Common Stock;

                  (2) subdivides its outstanding shares of Common Stock into a
         greater number of shares; or

                  (3) combines its outstanding shares of Common Stock into a
         smaller number of shares;

then the number of shares of its Common Stock issuable upon exercise of any
Warrant in effect immediately prior to such action shall be proportionately
adjusted so that the Holder of any Warrant thereafter exercised may receive the
aggregate number of shares of Common Stock which such Holder would have owned
immediately following such action if such Warrant had been exercised immediately
prior to such action.

                  The adjustment shall become effective immediately after the
record date in the case of a dividend or distribution and immediately after the
effective date in the case of a subdivision, combination or reclassification.

                  Such adjustment shall be made successively whenever any event
listed above shall occur.

                  (c) NOTICE OF ADJUSTMENT.

                  Whenever the number of Warrant Shares issuable upon exercise
of one Warrant is adjusted, Parent shall provide the notices required by Section
13 hereof.

                  (d) REORGANIZATION OF COMPANY.

                  If any capital reorganization or reclassification of the
capital stock of Parent or any consolidation or merger of Parent with another
corporation or entity or the sale of all or substantially all of its assets to
another corporation or entity shall be effected in such a way that holders of
Common Stock or Parent Convertible Preferred Stock shall be entitled to receive
stock, securities or assets in exchange for Common Stock or Parent Convertible
Preferred Stock, upon consummation of such transaction the Warrants shall
automatically become exercisable for the kind and amount of stock, securities,

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or assets which the Holder of a Warrant would have owned immediately after such
transaction if the Holder had exercised the Warrant immediately before the
effective date of such transaction. Concurrently with the consummation of such
transaction, the corporation formed by or surviving any such transaction if
other than Parent, or the person to which such sale or conveyance shall have
been made, shall enter into a supplemental Warrant Agreement so providing and
further providing for adjustments which shall be as nearly equivalent as may be
practical to the adjustments provided for in this Section. The successor company
shall mail to Holders a notice describing the supplemental Warrant Agreement as
soon as reasonably practicable after the execution of any such supplemental
Warrant Agreement.

                  If this subsection (d) applies, subsections (a) and (b) of
this Section 11 do not apply.

                  (e) ADJUSTMENT IN EXERCISE PRICE.

                  (i) Upon each adjustment of the number of shares of Parent
Convertible Preferred Stock pursuant to this Section 11, the Preferred Exercise
Price for each Warrant outstanding prior to the making of the adjustment in the
number of shares of Parent Convertible Preferred Stock shall thereafter be
adjusted to the Preferred Exercise Price (calculated to the nearest hundredth of
one cent) obtained from the following formula:

                           E'= E x N
                                   N'

where:

         E' =     the adjusted Exercise Price.

         E  =     the Exercise Price prior to adjustment.

         N' =     the adjusted number of shares of Parent Convertible Preferred
                  Stock issuable upon exercise of a Warrant.

         N =      the number or shares of Parent Convertible Preferred Stock
                  previously issuable upon exercise of a Warrant prior to
                  adjustment.

                  (ii) Upon each adjustment of the number of shares of Common
Stock pursuant to this Section 11, the Common Exercise Price for each Warrant
outstanding prior to the making of the adjustment in the number of shares of
Common Stock shall thereafter be adjusted to the Common Exercise Price
(calculated to the nearest hundredth of one cent) obtained from the following
formula:

                           E'= E x N
                                   N'

where:

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         E' =     the adjusted Exercise Price.

         E  =     the Exercise Price prior to adjustment.

         N' =     the adjusted number of shares of Common Stock issuable upon
                  exercise of a Warrant.

         N =      the number or shares of Common Stock previously issuable upon
                  exercise of a Warrant prior to adjustment.

                  (iii) If any Escrow Warrants are cancelled in accordance with
Section 2.4(d) of the Merger Agreement, the Preferred Exercise Price for each
outstanding Warrant shall be adjusted subject to any other adjustments described
in subsections (a), (b) or (d) of this Section 11, to equal the quotient
obtained by dividing (1) the difference between (A) $10,000,000 and (B) the sum
of (I) the Closing Net Cash Amount and (II) the LTDN Interim Note Amount by (2)
the difference between (A) the Warrant Share Number and (B) such number of
Escrow Warrants cancelled.

                  (iv) If any Escrow Warrants are cancelled in accordance with
Section 2.4(d) of the Merger Agreement, the Common Exercise Price for each
outstanding Warrant shall be adjusted, subject to any other adjustments
described in subsections (a), (b) or (d) of this Section 11, to equal the
quotient obtained by dividing (1) the quotient obtained by dividing (A) the
difference between (I) $10,000,000 and (II) the sum of (a) the Closing Net Cash
Amount and (b) the LTDN Interim Note Amount by (B) the difference between (I)
the Warrant Share Number and (II) such number of Escrow Warrants cancelled by
(2) 400.

                  (f) FORM OF WARRANTS.

                  Irrespective of any adjustments in the number or kind of
shares purchasable upon the exercise of the Warrants, Warrants theretofore or
thereafter issued may continue to express the same price and number and kind of
shares as are stated in the Warrants initially issuable pursuant to this
Agreement.

                  SECTION 12. FRACTIONAL INTERESTS. Any one Warrant may be
exercised only in full and not in part. Parent shall not be required to issue
fractional Warrant Shares on the exercise of Warrants. If more than one Warrant
shall be presented for exercise at the same time by the same Holder, the number
of full Warrant Shares which shall be issuable upon the exercise thereof shall
be computed on the basis of the aggregate number of Warrant Shares purchasable
on exercise of the Warrants so requested to be exercised. If any fraction of a
Warrant Share would, except for the provisions of this Section 12, be issuable
on the exercise of any Warrants (or specified portion thereof), such fractional
interest shall be rounded down to the nearest whole share.

                  SECTION 13. NOTICES TO WARRANT HOLDERS. Upon any adjustment of
the Exercise Price or the number of Warrant Shares issuable upon exercise of one
Warrant pursuant to Section 11, Parent shall promptly thereafter cause to be
given to each of the registered Holders of the Warrant Certificates at such
Holder's address appearing on the Warrant register written notice of such

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adjustments by first-class mail, postage prepaid. Where appropriate, such notice
may be given in advance and included as a part of the notice required to be
mailed under the other provisions of this Section 13.

                  In case:

                  (a) of any consolidation or merger to which Parent is a party
and for which approval of any shareholders of Parent is required, or of the
conveyance or transfer of the properties and assets of Parent substantially as
an entirety, or a tender offer or exchange offer for shares of Common Stock; or

                  (b) of the voluntary or involuntary dissolution, liquidation
or winding up of Parent; or

                  (c) Parent proposes to take any action which would require an
adjustment of the number of Warrant Shares issuable upon exercise of one Warrant
pursuant to Section 11;

then Parent shall cause to be given to each of the registered Holders of the
Warrant Certificates at such Holder's address appearing on the Warrant register,
at least 10 days prior to the applicable record date hereafter specified, or
promptly in the case of events for which there is no record date, by first class
mail, postage prepaid, a written notice stating (i) the date as of which the
holders of record of shares of or Parent Convertible Preferred Stock or Common
Stock, as the case may be, to be entitled to receive any such distribution are
to be determined, or (ii) the initial expiration date set forth in any tender
offer or exchange offer for shares of Common Stock, or (iii) the date on which
any such consolidation, merger, conveyance, transfer, dissolution, liquidation
or winding up is expected to become effective or consummated. The failure to
give the notice required by this Section 13 or any defect therein shall not
affect the legality or validity of any distribution, right, option, warrant,
consolidation, merger, conveyance, transfer, dissolution, liquidation or winding
up, or the vote upon any action.

                  Nothing contained in this Agreement or in any of the Warrant
Certificates shall be construed as conferring upon the Holders thereof the right
to vote or to consent or to receive notice as shareholders in respect of the
meetings of shareholders or the election of Directors of Parent or any other
matter, or any rights whatsoever as shareholders of Parent.

                  SECTION 14. NOTICES TO COMPANY AND HOLDERS. Any notice or
demand authorized by this Agreement to be given or made by the registered Holder
of any Warrant Certificate to or on Parent shall be sufficiently given or made
when and if deposited in the mail, first class or registered, postage prepaid,
addressed to the office of Parent expressly designated by Parent at its office
for purposes of this Agreement (until the Holders are otherwise notified in
accordance with this Section by Parent), as follows:

                           Advanced Technology Industries, Inc.
                           2030 Main Street, Ste 1300
                           Irvine, CA 92614

                           Attention: James Samuelson

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                  Any notice pursuant to this Agreement to be given by Parent to
the registered Holder(s) of any Warrant Certificate shall be sufficiently given
when and if deposited in the mail, first class or registered, postage prepaid,
addressed (until Parent is otherwise notified in accordance with this Section by
such Holder) to such Holder at the address appearing on the Warrant register of
Parent.

                  SECTION 15. SUPPLEMENTS AND AMENDMENTS. Parent may from time
to time supplement or amend this Agreement without the approval of any Holders
of Warrant Certificates in order to cure any ambiguity or to correct or
supplement any provision contained herein which may be defective or inconsistent
with any other provision herein, or to make any other provisions in regard to
matters or questions arising hereunder which Parent may deem necessary or
desirable and which shall not in any way adversely affect the interests of the
Holders of Warrant Certificates or discriminate against any Holder of Warrant
Certificates. Any amendment or supplement to this Agreement that has an adverse
effect on the interests of Holders shall require the written consent of
registered Holders of a majority of the then outstanding Warrants. Each Holder
of a Warrant outstanding at the time of any such amendment or supplement or
thereafter shall be bound by any amendment or supplement effected pursuant to
this Section 15, whether or not any notice, writing or marking indicating such
amendment or supplement appears on the Warrant or is delivered to such Holder.

                  SECTION 16. SUCCESSORS. All the covenants and provisions of
this Agreement by or for the benefit of Parent shall bind and inure to the
benefit of its respective successors and assigns hereunder.

                  SECTION 17. TERMINATION. This Agreement shall terminate upon
the termination of the Exercise Period.

                  SECTION 18. GOVERNING LAW. This Agreement and, and all claims
arising hereunder or relating thereto, shall be governed by and construed in
accordance with the laws of the State of New York.

                  SECTION 19. BENEFITS OF THIS AGREEMENT. Nothing in this
Agreement shall be construed to give to any person or corporation other than
Parent and the registered Holders of the Warrant Certificates or Warrant Shares
any legal or equitable right, remedy or claim under this Agreement; but this
Agreement shall be for the sole and exclusive benefit of Parent and the
registered Holders of the Warrant Certificates and the Warrant Shares.

                  SECTION 20. COUNTERPARTS. This Agreement may be executed in
two counterparts and each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts shall together constitute but one
and the same instrument.

                  SECTION 21. SEVERABILITY. In the event that any one or more of
the provisions contained herein, or the application thereof in any
circumstances, is held invalid, illegal or unenforceable in any respect for any
reason, the validity, legality and enforceability of any such provisions in
every other respect and of the remaining provisions hereof shall not be in any
way impaired or affected thereby, it being intended that all of the rights and
privileges of the parties hereto shall be enforceable to the fullest extent
permitted by law.

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                  IN WITNESS WHEREOF, the parties hereto have caused this
Agreement to be duly executed by their respective authorized officers as of the
day and year first above written.

                                            ADVANCED TECHNOLOGY INDUSTRIES, INC.

                                            By:_________________________________
                                                     Name:
                                                     Title:

                                            LTDNETWORK, INC.

                                            By:_________________________________
                                                     Name:
                                                     Title:

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                                                                       EXHIBIT A

                          [Form of Warrant Certificate]
                                     [Face]

                  "THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE U.S.
SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND,
ACCORDINGLY, MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT
SUBJECT TO, SUCH REGISTRATION."

No.                                                                ____ Warrants

                               Warrant Certificate
                      Advanced Technology Industries, Inc.

                  Reference is made to the Warrant Agreement dated as of
December 15, 2004 (the "Warrant Agreement") between Advanced Technology
Industries, Inc., a Delaware corporation ("Parent"), and LTDnetwork, Inc.
Capitalized terms used herein without definition shall have the meanings
ascribed to them in the Warrant Agreement. This Warrant Certificate certifies
that _____________, or registered assigns, is the registered holder of [ ]
Warrants. Each Warrant entitles the holder upon exercise to receive from Parent
until [ ] such number of Warrant Shares as described in the Warrant Agreement
upon payment of the Exercise Price and upon surrender of this Warrant
Certificate at the office of Parent designated for such purpose, but only
subject to the conditions set forth herein and in the Warrant Agreement.

                  The number of Warrant Shares issuable upon exercise of the
Warrants is subject to adjustment upon the occurrence of certain events set
forth in the Warrant Agreement.

                  No Warrant may be exercised after [ ], 2005 and to the extent
not exercised by such time such Warrants shall become void.

                  Reference is hereby made to the further provisions of this
Warrant Certificate set forth on the reverse hereof and such further provisions
shall for all purposes have the same effect as though fully set forth at this
place.

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                  IN WITNESS WHEREOF, Advanced Technology Industries, Inc. has
caused this Warrant Certificate to be signed by the appropriate officers.

Dated:

                                            ADVANCED TECHNOLOGY INDUSTRIES, INC.

                                            By:_________________________________
                                                     Name:
                                                     Title:

                                            By:_________________________________
                                                     Name:
                                                     Title:

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                          [Form of Warrant Certificate]
                                    [Reverse]

                  The Warrants evidenced by this Warrant Certificate are part of
a duly authorized issue of Warrants entitling the holder on exercise to receive
such number of Warrant Shares as described in the Warrant Agreement, which
Warrant Agreement is hereby incorporated by reference in and made a part of this
instrument and is hereby referred to for a description of the rights, limitation
of rights, obligations, duties and immunities thereunder of Parent and the
holders (the words "holders" or "holder" meaning the registered holders or
registered holder) of the Warrants. A copy of the Warrant Agreement may be
obtained by the holder hereof upon written request to Parent.

                  Subject to the terms of the Warrant Agreement, Warrants may be
exercised until [ ], 2005. The holder of Warrants evidenced by this Warrant
Certificate may exercise them by surrendering this Warrant Certificate, with the
form of election to purchase set forth hereon properly completed and executed,
together with payment of the Exercise Price in cash at the office of Parent
designated for such purpose. In the event that upon any exercise of Warrants
evidenced hereby the number of Warrants exercised shall be less than the total
number of Warrants evidenced hereby, there shall be issued to the holder hereof
or his assignee a new Warrant Certificate evidencing the number of Warrants not
exercised.

                  The Warrant Agreement provides that upon the occurrence of
certain events the number of Warrant Shares issuable upon exercise of one
Warrant set forth on the face hereof and the Exercise Price of a Warrant may,
subject to certain conditions, be adjusted.

                  The holders of the Warrants are entitled to certain
registration rights with respect to shares of Parent Convertible Preferred Stock
and Common Stock purchasable upon exercise as described in Section 10 of the
Warrant Agreement.

                  Warrant Certificates, when surrendered at the office of Parent
by the registered holder thereof in person or by legal representative or
attorney duly authorized in writing, may be exchanged, in the manner and subject
to the limitations provided in the Warrant Agreement, but without payment of any
service charge, for another Warrant Certificate or Warrant Certificates of like
tenor evidencing in the aggregate a like number of Warrants.

                  Upon due presentation for registration of transfer of this
Warrant Certificate at the office of Parent a new Warrant Certificate or Warrant
Certificates of like tenor and evidencing in the aggregate a like number of
Warrants shall be issued to the transferee(s) in exchange for this Warrant
Certificate, subject to the limitations provided in the Warrant Agreement,
without charge except for any tax or other governmental charge imposed in
connection therewith.

                  Parent may deem and treat the registered holder(s) thereof as
the absolute owner(s) of this Warrant Certificate (notwithstanding any notation
of ownership or other writing hereon made by anyone), for the purpose of any
exercise hereof, of any distribution to the holder(s) hereof, and for all other
purposes, and Parent shall not be affected by any notice to the contrary.
Neither the Warrants nor this Warrant Certificate entitles any holder hereof to
any rights of a stockholder of Parent.

                                       14

<PAGE>

                                 ASSIGNMENT FORM

                  If you the Holder want to assign this Warrant, fill in the
form below and have your signature guaranteed:

I or we assign and transfer this Warrant to:

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

                  (Print or type name, address and zip code and
                  social security or tax ID number of assignee)

and irrevocably appoint ____________________________________, agent to transfer
this Warrant on the books of Parent. The agent may substitute another to act for
him.

Date:                                  Signed:
                                                (Signed exactly as your name
                                                appears on the other side of
                                                this Warrant)

Signature Guarantee: ____________________________

The undersigned confirms that this Warrant is being transferred:

                                       15

<PAGE>

                                   [CHECK ONE]

(1) __    to Parent or a subsidiary thereof;

(2) __    outside the United States to a "foreign person" in compliance with
          Rule 904 of Regulation S under the Securities Act;

(3) __    pursuant to the exemption from registration provided by Rule 144 under
          the Securities Act; or

(4) __    pursuant to another available exemption from the registration
          requirements of the Securities Act.

Unless one of the boxes is checked, Parent will refuse to register any of the
Warrants evidenced by this certificate in the name of any person other than the
registered holder thereof; provided that if box (2), (3) or (4) is checked,
Parent may require, prior to registering any such transfer, in its sole
discretion, such legal opinions, certifications and other information as Parent
may reasonably request to confirm that such transfer is being made pursuant to
an exemption from, or in a transaction not subject to, the registration
requirements of the Securities Act. If none of the foregoing boxes is checked,
Parent shall not be obligated to register this Warrant in the name of any person
other than the holder hereof unless and until the conditions to any such
transfer of registration set forth herein shall have been satisfied.

Date:                                   Signed:
                                                 (Signed exactly as your name
                                                 appears on the other side of
                                                 this Warrant)

Signature Guarantee:

                                       16

<PAGE>

                         [Form of Election to Purchase]

                    (To Be Executed Upon Exercise Of Warrant)

                  The undersigned hereby irrevocably elects to exercise the
Warrant, represented by this Warrant Certificate, to receive ______ shares of
[Parent Convertible Preferred Stock] [Common Stock] and herewith tenders payment
for such shares to the order of Advanced Technology Industries, Inc. in the
amount of $_________ in accordance with the terms hereof.

                  The undersigned requests that a certificate for such shares be
registered in the name of _________, whose address is __________________, and
that such shares be delivered to _________________, whose address is
________________.

                  If said number of shares is less than all of the shares of
[Parent Convertible Preferred Stock] [Common Stock] purchasable hereunder, the
undersigned requests that a new Warrant Certificate representing the remaining
balance of such shares be registered in the name of _______________, whose
address is, ______________ and that such Warrant Certificate be delivered to,
_____________ whose address is ____________________.

                                            Signature:

                                            Date:

                                            Signature Guaranteed:

                                       17<PAGE>

EXHIBIT 4.2

                          REGISTRATION RIGHTS AGREEMENT

         REGISTRATION RIGHTS AGREEMENT dated as of December 15, 2004 (this
"Agreement") between Advanced Technology Industries, Inc., a Delaware
corporation ("Parent"), and LTDnetwork, Inc., a Delaware corporation (the
"Company").

         WHEREAS, Parent, the Company and LTDN Acquisition Corp., a Delaware
corporation ("Acquisition"), have entered into an Amended and Restated Agreement
and Plan of Merger dated as of August 11, 2004 (the "Merger Agreement") which
provides for the merger (the "Merger") of the Company with and into Acquisition;

         WHEREAS, in connection with the Merger, Parent intends to issue to the
stockholders of the Company shares of series A convertible preferred stock, par
value $0.001, of Parent (the "Parent Convertible Preferred Stock") and warrants
(the "Parent Warrants") to purchase shares of Parent Convertible Preferred Stock
or shares of Common Stock, as the case may be;

         WHEREAS, the shares of Parent Convertible Preferred Stock will be
converted into shares of common stock, par value $0.001, of Parent (the "Common
Stock") if the stockholders of Parent approve an amendment to Parent's
Certificate of Incorporation (the "Certificate of Incorporation Amendment") to
increase the authorized capital stock of Parent in an amount sufficient such
that all shares of Parent Convertible Preferred Stock can be converted into
shares of Common Stock and all shares Common Stock subject to the Parent
Warrants can be issued upon exercise of such Parent Warrants; and

         WHEREAS, the execution of this Agreement is a condition to the closing
of the Merger under the Merger Agreement.

         NOW, THEREFORE, in consideration of the foregoing and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

         1.       DEFINITIONS.

         (a) Capitalized terms used herein without definition shall have the
meanings ascribed to them in the Merger Agreement. As used in this Agreement,
the following defined terms shall have the following meanings:

         "Act" or "Securities Act" means the Securities Act of 1933, as amended.

         "Affiliate" of any specified person means any other person which,
directly or indirectly, is in control of, is controlled by, or is under common
control with such specified person. For purposes of this definition, control of
a person means the power, direct or indirect, to direct or cause the direction
of the management and policies of such person whether by contract or otherwise;
and the terms "controlling" and "controlled" have meanings correlative to the
foregoing.

                                       1

<PAGE>

         "Commission" means the United States Securities and Exchange
Commission, or any other federal agency at the time administering the Exchange
Act or the Securities Act, whichever is the relevant statute for the particular
purpose.

         "Deferral Notice" has the meaning assigned thereto in Section 2(c).

         "Effective Time" means the date on which the Commission declares the
Shelf Registration Statement effective or on which the Shelf Registration
Statement otherwise becomes effective.

         "Effectiveness Period" has the meaning assigned thereto in Section
2(b).

         "Electing Holder" has the meaning assigned thereto in Section
3(a)(iii).

         "Exchange Act" means the Securities Exchange Act of 1934, as amended.

         "Holder" means any person that is the record owner of Registrable
Securities.

         "Losses" has the meaning assigned thereto in Section 5(a).

         "Material Event" has the meaning assigned thereto in Section 2(a).

         "Merger Anniversary Date" means the later of (a) the date which is the
first anniversary of the date on which the Merger is consummated and (b) the
date Parent has received the Additional Company Financial Statements.

         "Notice and Questionnaire" means a Notice of Registration Statement and
Selling Securityholder Questionnaire substantially in the form of Exhibit A
hereto.

         The term "person" means an individual, partnership, corporation, trust
or unincorporated organization, or a government or agency or political
subdivision thereof.

         "Preferred Filing Date" means the later of (a) the date Parent files
the Certificate of Incorporation Amendment with the Secretary of State of the
State of Delaware and (b) the date Parent has received the Additional Company
Financial Statements.

         "Prospectus" means the prospectus (including, without limitation, any
preliminary prospectus, any final prospectus and any prospectus that discloses
information previously omitted from a prospectus filed as part of an effective
registration statement in reliance upon Rule 430A under the Act) included in the
Shelf Registration Statement, as amended or supplemented by any prospectus
supplement with respect to the terms of the offering of any portion of the
Registrable Securities covered by the Shelf Registration Statement and by all
other amendments and supplements to such prospectus, including all material
incorporated by reference in such prospectus and all documents filed after the
date of such prospectus by Parent under the Exchange Act and incorporated by
reference therein.

                                       2

<PAGE>

         "Registrable Securities" means the shares of Common Stock issuable upon
conversion of the Parent Convertible Preferred Stock or upon exercise of the
Parent Warrants, and if the Preferred Filing Date has not occurred by the Merger
Anniversary Date, the shares of Parent Convertible Preferred Stock; provided,
HOWEVER, that a security ceases to be a Registrable Security when it is no
longer a Restricted Security.

         "Restricted Security" means any shares of Parent Convertible Stock or
Common Stock issuable upon conversion thereof or issuable upon exercise of a
Parent Warrant except any such shares which (i) have been effectively registered
under the Securities Act and sold in a manner contemplated by the Shelf
Registration Statement, or (ii) have been transferred in compliance with Rule
144 under the Securities Act (or any successor provision thereto) or is
transferable pursuant to Rule 144 (or any successor provision thereto) within a
single three-month period.

         "Rules and Regulations" means the published rules and regulations of
the Commission promulgated under the Securities Act or the Exchange Act, as in
effect at any relevant time.

         "Seller Information" has the meaning assigned thereto in Section 5(a).

         "Shelf Registration" means a registration effected pursuant to Section
2.

         "Shelf Registration Statement" means a "shelf" registration statement
filed under the Securities Act providing for the registration of, and the sale
on a continuous or delayed basis by the Holders of, all of the Registrable
Securities pursuant to Rule 415 under the Securities Act and/or any similar rule
that may be adopted by the Commission, filed by Parent pursuant to the
provisions of Section 2, including the Prospectus contained therein, any
amendments and supplements to such registration statement, including
post-effective amendments, and all exhibits and all material incorporated by
reference in such registration statement.

         2.       SHELF REGISTRATION.

         (a) Parent shall use its reasonable efforts to, no later than 90
calendar days following the Preferred Filing Date, and, if shares of Parent
Convertible Preferred Stock are to be registered, no later than 90 days
following the Merger Anniversary Date, file with the Commission a Shelf
Registration Statement relating to the offer and sale of the Registrable
Securities by the Holders from time to time in accordance with the methods of
distribution elected by such Holders and set forth in such Shelf Registration
Statement and, thereafter, shall use its reasonable efforts to cause such Shelf
Registration Statement to be declared effective under the Act no later than 180
calendar days following the Preferred Filing Date, and, if shares of Parent
Convertible Preferred Stock are to be registered, no later than 180 days
following the Merger Anniversary Date; PROVIDED, HOWEVER, that Parent may, upon
written notice to all Holders, postpone having the Shelf Registration Statement
declared effective for a reasonable period not to exceed 135 days if as a result
of the occurrence or existence of any pending corporate development (a "Material
Event"), including, without limitation, the acquisition or disposition of assets
and similar events, Parent determines in its reasonable discretion that it is
appropriate to postpone having the Shelf Registration Statement declared
effective. Notwithstanding any provision herein no Holder shall be entitled to
be named as a selling securityholder in the Shelf Registration Statement or to
use the Prospectus forming a part thereof for resales of Registrable Securities
unless such Holder is an Electing Holder. The offering made pursuant to the
Shelf Registration Statement shall not be underwritten.

                                       3

<PAGE>

         (b) Parent shall use its reasonable efforts to keep the Shelf
Registration Statement continuously effective in order to permit the Prospectus
forming a part thereof to be usable by Holders until the earliest of (1) the
sale of all Registrable Securities registered under the Shelf Registration
Statement; (2) the expiration of the period referred to in Rule 144(k) of the
Act with respect to all Registrable Securities held by Persons that are not
Affiliates of Parent; and (3) two years from the date such Shelf Registration
Statement is declared effective (such period being referred to herein as the
"Effectiveness Period").

         (c) Upon (A) the issuance by the Commission of a stop order suspending
the effectiveness of the Shelf Registration Statement or the initiation of
proceedings with respect to the Shelf Registration Statement under Section 8(d)
or 8(e) of the Securities Act, (B) the occurrence of any event or the existence
of any fact as a result of which the Shelf Registration Statement shall contain
any untrue statement of a material fact or omit to state any material fact
required to be stated therein or necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading, or any
Prospectus shall contain any untrue statement of a material fact or omit to
state any material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, or (C) the occurrence or existence of any Material Event
that, in the reasonable discretion of Parent, makes it appropriate to suspend
the availability of the Shelf Registration Statement and the related Prospectus,
Parent shall give notice to the Electing Holders that the availability of the
Shelf Registration Statement is suspended (a "Deferral Notice") and, upon
receipt of any Deferral Notice, each Electing Holder agrees not to sell any
Registrable Securities pursuant to the Shelf Registration Statement until such
Electing Holder's receipt of copies from Parent of a supplemented or amended
Prospectus, or until it is advised in writing by Parent that the Prospectus may
be used, and has received copies of any additional or supplemental filings that
are incorporated or deemed incorporated by reference in such Prospectus. Parent
will use all reasonable efforts to ensure that the use of the Prospectus may be
resumed (x) in the case of clause (A) above, as promptly as is practicable, (y)
in the case of clause (B) above (other than with respect to events or
circumstances described in clause (A) or (C) above), as soon as, in the
reasonable judgment of Parent, neither the Registration Statement nor the
Prospectus contains any untrue statement of a material fact or omits to state
any material fact required to be stated therein or necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading, and (z) in the case of clause (C) above, as soon as, in
the discretion of Parent, such suspension is no longer appropriate.

         3. REGISTRATION PROCEDURES. In connection with the Shelf Registration
Statement, the following provisions shall apply:

         (a) (i) Not less than 30 calendar days prior to the time Parent intends
in good faith to have the Shelf Registration Statement declared effective,
Parent shall mail the Notice and Questionnaire to the Holders. No Holder shall
be entitled to be named as a selling securityholder in the Shelf Registration
Statement as of the Effective Time, and no Holder shall be entitled to use the
Prospectus forming a part thereof for resales of Registrable Securities at any
time, unless such Holder has returned a completed and signed Notice and
Questionnaire to Parent by the deadline for response set forth therein;
PROVIDED, HOWEVER, Holders shall have at least 20 calendar days from the date on
which the Notice and Questionnaire is first mailed to such Holders to return a
completed and signed Notice and Questionnaire to Parent.

                                       4

<PAGE>

                  (ii) After the Effective Time, Parent shall, upon the request
         of any Holder that is not then an Electing Holder, promptly send a
         Notice and Questionnaire to such Holder. Parent shall not be required
         to take any action to name such Holder as a selling securityholder in
         the Shelf Registration Statement or to enable such Holder to use the
         Prospectus forming a part thereof for resales of Registrable Securities
         until such Holder has returned a completed and signed Notice and
         Questionnaire to Parent.

                  (iii) The term "Electing Holder" shall mean any Holder that
         has returned a completed and signed Notice and Questionnaire to Parent
         in accordance with Section 3(a)(i) or 3(a)(ii).

         (b) Except during any period during which the use of the Prospectus may
be suspended by Parent pursuant to Section 2(c), Parent shall promptly take such
action as may be necessary so that (i) each of the Shelf Registration Statement
and any amendment thereto and the Prospectus forming a part thereof and any
amendment or supplement thereto (and each report or other document incorporated
therein by reference in each case) complies in all material respects with the
Securities Act and the Exchange Act and the respective rules and regulations
thereunder, (ii) each of the Shelf Registration Statement and any amendment
thereto does not, when it becomes effective, contain an untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements therein not misleading and (iii) each of the
Prospectus forming part of the Shelf Registration Statement, and any amendment
or supplement to such Prospectus, does not at any time during the Effectiveness
Period include an untrue statement of a material fact or omit to state a
material fact necessary in order to make the statements therein, in the light of
the circumstances under which they were made, not misleading; PROVIDED that
Parent shall be entitled to rely on any Seller Information.

         (c) Parent shall promptly advise each Electing Holder, and shall
confirm such advice in writing if so requested by any such Holder when a Shelf
Registration Statement and any amendment thereto has been filed with the
Commission and when a Shelf Registration Statement or any post-effective
amendment thereto has become effective.

         (d) Parent shall use its reasonable efforts to prevent the issuance,
and if issued to obtain the withdrawal, of any order suspending the
effectiveness of the Shelf Registration Statement at the earliest possible time.

         (e) Parent shall furnish to each Electing Holder, if such Holder so
requests in writing, without charge, at least one copy of the Shelf Registration
Statement and all post-effective amendments thereto, including financial
statements and schedules, and all reports, other documents and exhibits that are
filed with or incorporated by reference in the Shelf Registration Statement.

         (f) Parent shall, during the Effectiveness Period, deliver to each
Electing Holder, without charge, as many copies of the Prospectus (including
each preliminary Prospectus) included in the Shelf Registration Statement and
any amendment or supplement thereto as such Electing Holder may reasonably
request; and Parent consents (except during any suspension period pursuant to
Section 2(c)) to the use of the Prospectus and any amendment or supplement
thereto by each of the Electing Holders in connection with the offering and sale
of the Registrable Securities covered by the Prospectus and any amendment or
supplement thereto during the Effectiveness Period.

                                       5

<PAGE>

         (g) Prior to any offering of Registrable Securities pursuant to the
Shelf Registration Statement, Parent shall (i) register or qualify or cooperate
with the Electing Holders and their respective counsel in connection with the
registration or qualification of such Registrable Securities for offer and sale
under the securities or "blue sky" laws of such jurisdictions within the United
States as any Electing Holder may reasonably request, (ii) keep such
registrations or qualifications in effect and comply with such laws so as to
permit the continuance of offers and sales in such jurisdictions for so long as
may be necessary to enable any Electing Holder to complete its distribution of
Registrable Securities pursuant to the Shelf Registration Statement, and (iii)
take any and all other actions reasonably necessary or advisable to enable the
disposition in such jurisdictions of such Registrable Securities; PROVIDED,
HOWEVER, that in no event shall Parent be obligated to (A) qualify as a foreign
corporation or as a dealer in securities in any jurisdiction where it would not
otherwise be required to so qualify but for this Section 3(g), (B) file any
general consent to service of process in any jurisdiction where it is not as of
the date hereof so subject or (C) subject itself to taxation in any jurisdiction
where it is not as of the date hereof so subject.

         (h) Parent shall cooperate with the Electing Holders to facilitate the
timely preparation and delivery of certificates representing Registrable
Securities to be sold pursuant to the Shelf Registration Statement, which
certificates, shall be free of any restrictive legends and in such permitted
denominations and registered in such names as Electing Holders may request in
connection with the sale of Registrable Securities pursuant to the Shelf
Registration Statement.

         (i) Upon the occurrence of any fact or event contemplated by clause
(A), (B) or (C) of Section 2(c), Parent shall following the satisfaction of the
time periods set forth in the last sentence of Section 2(c), prepare, if
necessary, a post-effective amendment to any Shelf Registration Statement or any
amendment or supplement to the related Prospectus or file any other required
document so that, as thereafter delivered to purchasers of the Registrable
Securities included therein, the Prospectus will not include an untrue statement
of a material fact or omit to state any material fact necessary to make the
statements therein, in the light of the circumstances under which they were
made, not misleading; PROVIDED that Parent shall be entitled to rely on any
Seller Information.

         4. REGISTRATION EXPENSES. Except as otherwise provided in Section 3,
Parent shall bear all fees and expenses incurred in connection with the
performance of its obligations under Sections 2 and 3 hereof. Each Electing
Holder shall pay all underwriting discounts and commissions and transfer taxes,
if any, relating to the sale or disposition of such Electing Holder's
Registrable Securities pursuant to the Shelf Registration Statement.

         5. INDEMNIFICATION AND CONTRIBUTION.

         (a) INDEMNIFICATION BY PARENT. Upon the registration of the Registrable
Securities pursuant to Section 2, Parent shall indemnify and hold harmless each
Electing Holder, and each of such Electing Holder's officers and directors and
each person who controls such Electing Holder within the meaning of Section 15
of the Securities Act or Section 20 of the Exchange Act (each such person being

                                       6

<PAGE>

sometimes referred to as an "Indemnified Person") against any losses, claims,
damages or liabilities (collectively, "Losses"), joint or several, to which such
Indemnified Person may become subject under the Securities Act or otherwise,
insofar as such Losses (or actions in respect thereof) arise out of or are based
upon an untrue statement or alleged untrue statement of a material fact
contained in any Shelf Registration Statement under which such Registrable
Securities are to be registered under the Securities Act, or any Prospectus
contained therein or furnished by Parent to any Indemnified Person, or any
amendment or supplement thereto, or arise out of or are based upon the omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein (in the case of the
Prospectus, in light of the circumstances under which they were made) not
misleading, and Parent hereby agrees to reimburse such Indemnified Person for
any legal or other expenses reasonably incurred by them in connection with
investigating or defending any such action or claim as such expenses are
incurred; PROVIDED, HOWEVER, that Parent shall not be liable to any such
Indemnified Person in any such case to the extent that any such Losses arise out
of or are based upon an untrue statement or alleged untrue statement or omission
or alleged omission made in such Shelf Registration Statement or Prospectus, or
amendment or supplement, in reliance upon and in conformity with written
information furnished to Parent by any Holder, expressly for use therein (the
"Seller Information"); PROVIDED, FURTHER, that Parent shall not be liable to any
Indemnified Person on account of any such Losses arising out of or based upon an
untrue statement or alleged untrue statement or omission or alleged omission
made in any Prospectus if either (A) (i) the applicable Holder failed to send or
deliver a copy of the Prospectus with or prior to the delivery of written
confirmation of the sale by such Holder to the person asserting the claim from
which such Losses arise and (ii) the Prospectus would have corrected such untrue
statement or alleged untrue statement or such omission or alleged omission, or
(B) (x) such untrue statement or alleged untrue statement, omission or alleged
omission is corrected in an amendment or supplement to the Prospectus and (y)
having previously been furnished by or on behalf of Parent with copies of the
Prospectus as so amended or supplemented, such Holder thereafter fails to
deliver such Prospectus as so amended or supplemented, with or prior to the
delivery of written confirmation of the sale of a Registrable Security to the
person asserting the claim from which such Losses arise.

         (b) INDEMNIFICATION BY THE HOLDERS. Each Electing Holder agrees, as a
consequence of the inclusion of any of such Holder's Registrable Securities in
such Shelf Registration Statement, severally and not jointly, to (i) indemnify
and hold harmless Parent, its directors and officers who sign any Shelf
Registration Statement and each person, if any, who controls Parent within the
meaning of either Section 15 of the Securities Act or Section 20 of the Exchange
Act, against any Losses, to which Parent or such other persons may become
subject, under the Securities Act or otherwise, insofar as such Losses (or
actions in respect thereof) arise out of or are based upon an untrue statement
or alleged untrue statement of a material fact contained in such Shelf
Registration Statement or Prospectus, or any amendment or supplement, or arise
out of or are based upon the omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, in each case to the extent, but only to the extent, that
such untrue statement or alleged untrue statement or omission or alleged
omission was made in reliance upon and in conformity with written information
furnished to Parent by such Holder, expressly for use therein, and (ii)
reimburse Parent for any legal or other expenses reasonably incurred by Parent
in connection with investigating or defending any such action or claim as such
expenses are incurred.

                                       7

<PAGE>

         (c) NOTICES OF CLAIMS, ETC. Promptly after receipt by an indemnified
party under subsection (a) or (b) above of notice of the commencement of any
action, such indemnified party shall, if a claim in respect thereof is to be
made against an indemnifying party under this Section 5, notify such
indemnifying party in writing of the commencement thereof; but the omission so
to notify the indemnifying party shall not relieve it from any liability which
it may have to any indemnified party otherwise than under this Section 5. In
case any such action shall be brought against any indemnified party and it shall
notify an indemnifying party of the commencement thereof, such indemnifying
party shall be entitled to participate therein and, to the extent that it shall
wish, jointly with any other indemnifying party similarly notified, to assume
the defense thereof, with counsel satisfactory to such indemnified party, and,
after notice from the indemnifying party to such indemnified party of its
election so to assume the defense thereof, such indemnifying party shall not be
liable to such indemnified party under this Section 5 for any legal expenses of
other counsel or any other expenses, in each case subsequently incurred by such
indemnified party, in connection with the defense thereof other than reasonable
costs of investigation.

         (d) CONTRIBUTION. If the indemnification provided for in this Section 5
is unavailable to or insufficient to hold harmless an indemnified party under
subsection (a) or (b) above in respect of any Losses (or actions in respect
thereof) referred to therein, then each indemnifying party shall contribute to
the amount paid or payable by such indemnified party as a result of such Losses
(or actions in respect thereof) in such proportion as is appropriate to reflect
the relative fault of the indemnifying party and the indemnified party in
connection with the statements or omissions which resulted in such Losses (or
actions in respect thereof), as well as any other relevant equitable
considerations. The relative fault of such indemnifying party and the
indemnified party shall be determined by reference to, among other things,
whether the untrue or alleged untrue statement of a material fact or omission or
alleged omission to state a material fact relates to information supplied by
such indemnifying party or by such indemnified party, and the parties' relative
intent, knowledge, access to information and opportunity to correct or prevent
such statement or omission. The parties hereto agree that it would not be just
and equitable if contribution pursuant to this Section 5(d) were determined by
pro rata allocation (even if the Electing Holders were treated as one entity for
such purpose) or by any other method of allocation which does not take account
of the equitable considerations referred to in this Section 5(d). The amount
paid or payable by an indemnified party as a result of the Losses (or actions in
respect thereof) referred to above shall be deemed to include any legal or other
fees or expenses reasonably incurred by such indemnified party in connection
with investigating or defending any such action or claim. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The obligations of the Electing
Holders in this Section 5(d) to contribute shall be several in proportion to the
number of Registrable Securities registered by them and not joint.

         (e) Notwithstanding any other provision of this Section 5, in no event
will any Electing Holder be required to undertake liability to any person under
this Section 5 for any amounts in excess of the dollar amount of the proceeds to
be received by such Holder from the sale of such Holder's Registrable Securities
(after deducting any fees, discounts and commissions applicable thereto)
pursuant to any Shelf Registration Statement under which such Registrable
Securities are to be registered under the Securities Act.

                                       8

<PAGE>

         6.       MISCELLANEOUS.

         (a) OTHER REGISTRATION RIGHTS. Parent may grant registration rights
that would permit any person that is a third party the right to piggy-back on
any Shelf Registration Statement.

         (b) AMENDMENTS AND WAIVERS. This Agreement, including this Section
6(b), may be amended, and waivers or consents to departures from the provisions
hereof may be given, only by a written instrument duly executed by Parent and
the holders of a majority of Registrable Securities then outstanding. Each
Holder of Registrable Securities outstanding at the time of any such amendment,
waiver or consent or thereafter shall be bound by any amendment, waiver or
consent effected pursuant to this Section 6(b), whether or not any notice,
writing or marking indicating such amendment, waiver or consent appears on the
Registrable Securities or is delivered to such Holder.

         (c) NOTICES. All notices and other communications provided for or
permitted hereunder shall be given to the address of the Holders as such address
appears in the records of Parent.

         (d) PARTIES IN INTEREST. The parties to this Agreement intend that all
Holders of Registrable Securities shall be entitled to receive the benefits of
this Agreement and that any Electing Holder shall be bound by the terms and
provisions of this Agreement by reason of such election with respect to the
Registrable Securities which are included in a Shelf Registration Statement. All
the terms and provisions of this Agreement shall be binding upon, shall inure to
the benefit of and shall be enforceable by the respective successors and assigns
of the parties thereto and any Holder from time to time of the Registrable
Securities to the aforesaid extent. In the event that any transferee of any
Holder of Registrable Securities shall acquire Registrable Securities, in any
manner, whether by gift, bequest, purchase, operation of law or otherwise, such
transferee shall, without any further writing or action of any kind, be entitled
to receive the benefits of and, if an Electing Holder, be conclusively deemed to
have agreed to be bound by and to perform all of the terms and provisions of
this Agreement to the aforesaid extent.

         (e) COUNTERPARTS. This Agreement may be executed in two counterparts
and by the parties hereto in separate counterparts, each of which when so
executed shall be deemed to be an original and all of which taken together shall
constitute one and the same agreement.

         (f) HEADINGS. The headings in this Agreement are for convenience of
reference only and shall not limit or otherwise affect the meaning hereof.

         (g) GOVERNING LAW. THIS AGREEMENT, AND ALL CLAIMS ARISING HEREUNDER OR
RELATING HERETO, SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF NEW YORK.

         (h) SEVERABILITY. In the event that any one or more of the provisions
contained herein, or the application thereof in any circumstances, is held
invalid, illegal or unenforceable in any respect for any reason, the validity,
legality and enforceability of any such provision in every other respect and of
the remaining provisions hereof shall not be in any way impaired or affected
thereby, it being intended that all of the rights and privileges of the parties
hereto shall be enforceable to the fullest extent permitted by law.

                                       9

<PAGE>

         (i) SURVIVAL. The respective indemnities, agreements, representations,
warranties and other provisions set forth in this Agreement or made pursuant
hereto shall remain in full force and effect, regardless of any investigation
(or any statement as to the results thereof) made by or on behalf of any
Electing Holder, any director, officer or partner of such Holder, or any
controlling person of any of the foregoing, and shall survive the transfer and
registration of the Registrable Securities of such Holder.

                                       10

<PAGE>

          IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first above written.

                                            ADVANCED TECHNOLOGY INDUSTRIES, INC.

                                            By:_________________________________
                                                   Name:
                                                   Title:

                                            LTDNETWORK, INC.

                                            By:_________________________________
                                                   Name:
                                                   Title:

                                       11

<PAGE>

                      ADVANCED TECHNOLOGY INDUSTRIES, INC.

                        Notice of Registration Statement
                                       and
                      Selling Securityholder Questionnaire

                                     (Date)

         Reference is hereby made to the Registration Rights Agreement (the
"Registration Rights Agreement") between Advanced Technology Industries, Inc.
("Parent") and LTDnetwork, Inc. Pursuant to the Registration Rights Agreement,
Parent has filed with the United States Securities and Exchange Commission (the
"Commission") a registration statement on Form SB-2 (the "Shelf Registration
Statement") for the registration and resale under Rule 415 of the Securities Act
of 1933, as amended (the "Securities Act"), of Parent's [Common Stock] [Series A
Convertible Preferred Stock] (the "Securities"). A copy of the Registration
Rights Agreement is attached hereto. All capitalized terms not otherwise defined
herein shall have the meanings ascribed thereto in the Registration Rights
Agreement.

         Each beneficial owner of Registrable Securities is entitled to have the
Registrable Securities beneficially owned by it included in the Shelf
Registration Statement. In order to have Registrable Securities included in the
Shelf Registration Statement, this Notice of Registration Statement and Selling
Securityholder Questionnaire ("Notice and Questionnaire") must be completed,
executed and delivered to Parent's counsel at the address set forth herein for
receipt ON OR BEFORE [DEADLINE FOR RESPONSE]. Beneficial owners of Registrable
Securities who do not complete, execute and return this Notice and Questionnaire
by such date (i) will not be named as selling security holders in the Shelf
Registration Statement and (ii) may not use the Prospectus forming a part
thereof for resales of Registrable Securities.

         Certain legal consequences arise from being named as a selling
securityholder in the Shelf Registration Statement and related Prospectus.
Accordingly, holders and beneficial owners of Registrable Securities are advised
to consult their own securities law counsel regarding the consequences of being
named or not being named as a selling securityholder in the Shelf Registration
Statement and related Prospectus.

                                    ELECTION

         The undersigned holder (the "Selling Securityholder") of Registrable
Securities hereby elects to include in the Shelf Registration Statement the
Registrable Securities beneficially owned by it and listed below in Item (3).
The undersigned, by signing and returning this Notice and Questionnaire, agrees
to be bound with respect to such Registrable Securities by the terms and
conditions of this Notice and Questionnaire and the Registration Rights
Agreement, including, without limitation, Section 5 of the Registration Rights
Agreement, as if the undersigned Selling Securityholder were an original party
thereto.

                                       12

<PAGE>

         The Selling Securityholder hereby provides the following information to
Parent and represents and warrants that such information is accurate and
complete:

                                       13

<PAGE>

                                  QUESTIONNAIRE

1.       (a) Full Legal Name of Selling Securityholder:
         _______________________________________________________________________

         (b) Full Legal Name of Registered Holder (if not the same as in (a)
         above) of Registrable Securities Listed in Item (3) below:

         _______________________________________________________________________

2.       Address for Notice to Selling Securityholder:

                                __________________________
                                __________________________
             Telephone:         __________________________
             Fax:               __________________________
             Contact Person:    __________________________

3.       Beneficial Ownership of Securities:

         EXCEPT AS SET FORTH BELOW IN THIS ITEM (3), THE UNDERSIGNED DOES NOT
         BENEFICIALLY OWN ANY SECURITIES.

         (a) Principal amount of Registrable Securities beneficially owned:

         _______________________________________________________________________

         (b) Principal amount of Securities other than Registrable Securities
         beneficially owned:

         _______________________________________________________________________

         (c) Principal amount of Registrable Securities which the undersigned
         wishes to be included in the Shelf Registration Statement:

         _______________________________________________________________________

4.       Beneficial Ownership of other securities of Parent:

         Except as set forth below in this Item (4), the undersigned Selling
         Securityholder is not the beneficial or registered owner of any
         securities of Parent, other than the Securities listed above in Item
         (3).

         State any exceptions here:

5.       Relationships with Parent:

         Except as set forth below, neither the Selling Securityholder nor any
         of its affiliates, officers, directors or principal equity holders (5%
         or more) has held any position or office or has had any other material
         relationship with Parent (or its predecessors or affiliates) during the
         past three years.

                                       14

<PAGE>

         State any exceptions here:

6.       Plan of Distribution:

         Except as set forth below, the undersigned Selling Securityholder
         intends to distribute the Registrable Securities listed above in Item
         (3) only as follows (if at all): Such Registrable Securities may be
         sold from time to time directly by the undersigned Selling
         Securityholder. Such Registrable Securities may be sold in one or more
         transactions at fixed prices, at prevailing market prices at the time
         of sale, at varying prices determined at the time of sale, or at
         negotiated prices. Such sales may be effected in transactions (i) on
         any national securities exchange or quotation service on which the
         Registrable Securities may be listed or quoted at the time of sale,
         (ii) in the over-the-counter market, (iii) in transactions otherwise
         than on such exchanges or services or in the over-the-counter market,
         or (iv) through the writing of options. In connection with sales of the
         Registrable Securities or otherwise, the Selling Securityholder may
         enter into hedging transactions with broker-dealers, which may in turn
         engage in short sales of the Registrable Securities in the course of
         hedging the positions they assume. The Selling Securityholder may also
         sell Registrable Securities short and deliver Registrable Securities to
         close out such short positions, or loan or pledge Registrable
         Securities to broker-dealers that in turn may sell such securities.

         State any exceptions here:

                  Note: In no event may such method(s) of distribution take the
form of an underwritten offering of the Registrable Securities.

                  By signing below, the Selling Securityholder acknowledges that
it understands its obligation to comply, and agrees that it will comply, with
the provisions of the Exchange Act and the Securities Act and the rules and
regulations thereunder.

                  In the event that the Selling Securityholder transfers all or
any portion of the Registrable Securities listed in Item (3) above after the
date on which such information is provided to Parent, the Selling Securityholder
agrees to notify the transferee(s) at the time of the transfer of its rights and
obligations under this Notice and Questionnaire and the Registration Rights
Agreement.

                  By signing below, the Selling Securityholder consents to the
disclosure of the information contained herein in its answers to Items (1)
through (6) above and the inclusion of such information in the Shelf
Registration Statement and related Prospectus. The Selling Securityholder
understands that such information will be relied upon by Parent in connection
with the preparation of the Shelf Registration Statement and related Prospectus.

                                       15

<PAGE>

                  In accordance with the Selling Securityholder's obligation
under Section 3(a) of the Registration Rights Agreement to provide such
information as may be required by law for inclusion in the Shelf Registration
Statement, the Selling Securityholder agrees to promptly notify Parent of any
inaccuracies or changes in the information provided herein which may occur
subsequent to the date hereof at any time while the Shelf Registration Statement
remains in effect. All notices hereunder and pursuant to the Registration Rights
Agreement shall be made in writing, by hand-delivery, first-class mail, or air
courier guaranteeing overnight delivery as follows:

         (i)      To Parent:

                  ______________________
                  ______________________
                  ______________________
                  ______________________

         (ii)     With a copy to:

                  ______________________
                  ______________________
                  ______________________
                  ______________________

                  Once this Notice and Questionnaire is executed by the Selling
Securityholder and received by Parent's counsel, the terms of this Notice and
Questionnaire, and the representations and warranties contained herein, shall be
binding on, shall inure to the benefit of and shall be enforceable by the
respective successors, heirs, personal representatives, and assigns of Parent
and the Selling Securityholder (with respect to the Registrable Securities
beneficially owned by such Selling Securityholder and listed in Item (3) above).
This Agreement, and all claims arising hereunder or relating hereto, shall be
governed in all respects by the laws of the State of New York.

                  IN WITNESS WHEREOF, the undersigned, by authority duly given,
has caused this Notice and Questionnaire to be executed and delivered either in
person or by its duly authorized agent.

Dated:_________________

                           _____________________________________________________
                           Selling Securityholder
                           (Print/type full legal name of beneficial owner of
                            Registrable Securities)

                           By:__________________________________________________
                           Name:
                           Title:

PLEASE RETURN THE COMPLETED AND EXECUTED NOTICE AND QUESTIONNAIRE FOR RECEIPT ON
OR BEFORE [DEADLINE FOR RESPONSE] TO PARENT AT:

                                    Advanced Technology Industries, Inc.

                                       16

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