EXHIBIT 4.6


                     [FORM OF FACE OF EXCHANGE SECURITY] 



No. [_____]                                     Principal Amount $[____________]
                                                         CUSIP NO.  00758R A C 8


                   9 1/4% Senior Subordinated Notes due 2008

          Advanstar Communications Inc., a New York corporation, promises to pay
to [______________], or registered assigns, the principal sum of
[_______________] Dollars on May 1, 2008.

          Interest Payment Dates: May 1 and November 1

          Record Dates: April 15 and October 15

          Additional provisions of this Security are set forth on the other side
          of this Security.

                                        ADVANSTAR COMMUNICATIONS INC.


                                        By:__________________________


                                        By:__________________________

 
TRUSTEE'S CERTIFICATE OF
 AUTHENTICATION

The Bank of New York

as Trustee, certifies
that this is one of
the Securities referred
to in the Indenture.

By:
  Authorized Signatory                            Date:

                                      B-2

 
                  [FORM OF REVERSE SIDE OF EXCHANGE SECURITY]

                   9 1/4% Senior Subordinated Note due 2008

1.   Interest
     --------

     Advanstar Communications Inc., a New York corporation (such corporation,
and its successors and assigns under the Indenture hereinafter referred to,
being herein called the "Company"), promises to pay interest on the principal
amount of this Security at the rate per annum shown above.

     The Company will pay interest semiannually on May 1 and November 1 of each
year commencing November 1, 1998.  Interest on the Securities will accrue from
the most recent date to which interest has been paid on the Securities or, if no
interest has been paid, from April 30, 1998.  The Company shall pay interest on
overdue principal or premium, if any (plus interest on such interest to the
extent lawful), at the rate borne by the Securities to the extent lawful.
Interest will be computed on the basis of a 360-day year of twelve 30-day
months.

2.   Method of Payment
     -----------------

     By at least 10:00 a.m. (New York City time) on the date on which any
principal of or interest on any Security is due and payable, the Company shall
irrevocably deposit with the Trustee or the Paying Agent money sufficient to pay
such principal, premium, if any, and/or interest. The Company will pay interest
(except Defaulted Interest) to the Persons who are registered Holders of the
Securities at the close of business on the April 15 or October 15 next preceding
the interest payment date even if Securities are cancelled, repurchased or
redeemed after the record date and on or before the interest payment date.
Holders must surrender Securities to a Paying Agent to collect principal
payments. The Company will pay principal and interest in money of the United
States that at the time of payment is legal tender for payment of public and
private debts. However, the Company may pay principal and interest by check
payable in such money. It may mail an interest check to a Holder's registered
address.

3.   Paying Agent and Registrar
     --------------------------

     Initially, The Bank of New York, a banking corporation duly organized and
existing under the laws of the State of New York (the "Trustee"), will act as
Trustee, Paying Agent and Registrar.  The Company may appoint and change any
Paying Agent, Registrar or co-registrar without notice to any Securityholder.
The Company or any of its domestically incorporated Wholly-Owned Subsidiaries
may act as Paying Agent, Registrar or co-registrar.

                                      B-3

 
4.  Indenture
    ---------

    The Company issued the Securities under an Indenture dated as of April 30,
1998 (as it may be amended or supplemented from time to time in accordance with
the terms thereof, the "Indenture"), between the Company and the Trustee.  The
terms of the Securities include those stated in the Indenture and those made
part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S.C.
                                                                          ------
(S)(S) 77aaa-77bbbb) as in effect on the date of the Indenture (the "Act").
Capitalized terms used herein and not defined herein have the meanings ascribed
thereto in the Indenture.  The Securities are subject to all such terms, and
Securityholders are referred to the Indenture and the Act for a statement of
those terms.

    The Securities are general unsecured senior subordinated obligations of the
Company limited to $150.0 million aggregate principal amount (subject to Section
                                                                         -------
2.9 of the Indenture).  The aggregate principal amount of notes which may be
- ---                                                                         
authenticated and delivered under the Indenture, including the Securities, is
limited to $250.0 million (subject to Section 2.9 of the Indenture).  This
                                      -----------                         
Security is one of the Exchange Securities referred to in the Indenture.  The
Securities include the Initial Securities and any Exchange Securities issued in
exchange for the Initial Securities pursuant to the Indenture and the
Registration Rights Agreement.  The Initial Securities and the Exchange
Securities are treated as a single class of securities under the Indenture.  The
Indenture imposes certain limitations on:  the Incurrence of Indebtedness by the
Company and its Restricted Subsidiaries, the Incurrence of Indebtedness by the
Company and its Subsidiary Guarantors if subordinate or junior in any respect to
any Senior Indebtedness or Guarantor Senior Indebtedness, respectively, the
payment of dividends and other distributions on the Capital Stock of the Company
and its Restricted Subsidiaries, the purchase or redemption of Capital Stock of
the Company and Capital Stock of such Restricted Subsidiaries, certain purchases
or redemptions of Subordinated Indebtedness, the Incurrence of Liens by the
Company or its Restricted Subsidiaries, the entering into of Asset Swaps by the
Company or its Restricted Subsidiaries, the sale or transfer of assets and
Capital Stock of Restricted Subsidiaries, the issuance or sale of Capital Stock
of Restricted Subsidiaries, the business activities and investments of the
Company and its Restricted Subsidiaries, and transactions with Affiliates.  In
addition, the Indenture limits the ability of the Company and its Subsidiaries
to restrict distributions and dividends from Restricted Subsidiaries.

    To guarantee the due and punctual payment of the principal, premium, if any,
and interest on the Securities and all other amounts payable by the Company
under the Indenture and the Securities when and as the same shall be due and
payable, whether at maturity, by acceleration or otherwise, according to the
terms of the Securities and the Indenture, the Subsidiary Guarantors have
unconditionally guaranteed (and future Subsidiary Guarantors, together with the
Subsidiary Guarantors, will unconditionally guarantee), jointly and severally,
such obligations on a senior subordinated basis pursuant to the terms of the
Indenture.

                                      B-4

 
5.   Optional Redemption
     -------------------

     Except as set forth below, the Securities will not be redeemable at the
option of the Company prior to May 1, 2003. On and after such date, the
Securities will be redeemable, at the Company's option, in whole or in part, at
any time upon not less than 30 nor more than 60 days prior notice mailed by
first-class mail to each holder's registered address, at the following
redemption prices (expressed in percentages of principal amount), plus accrued
and unpaid interest to the redemption date (subject to the right of holders of
record on the relevant record date to receive interest due on the relevant
interest payment date):

     If redeemed during the 12-month period commencing on May 1 of the years set
forth below:



PERIOD REDEMPTION PRICE
- -----------------------
                                                              
2003                                                             104.625%
2004                                                             103.083%
2005                                                             101.542%
2006 and thereafter                                              100.000%

                                                                                
     In addition, at any time and from time to time prior to  May 1, 2001, the
Company may redeem in the aggregate up to 35% of the original principal amount
of the Securities with the proceeds of one or more Equity Offerings received by,
or invested in, the Company so long as there is a Public Market at the time of
such redemption, at a redemption price (expressed as a percentage of principal
amount) of 109.250% plus accrued and unpaid interest, if any, to the redemption
date (subject to the right of holders of record on the relevant record date to
receive interest due on the relevant interest payment date); provided, however,
that at least 65% of the original principal amount of the Securities must remain
outstanding after each such redemption; provided further, that each such
redemption occurs within 90 days of the date of closing of such Equity Offering.

     At any time on or prior to May 1, 2003, the Securities may also be redeemed
as a whole at the option of the Company upon the occurrence of a Change of
Control, upon not less than 30 nor more than 60 days prior notice (but in no
event more than 30 days after the occurrence of such Change of Control) mailed
by first-class mail to each holder's registered address, at a redemption price
equal to 100% of the principal amount thereof plus the Applicable Premium as of,
and accrued and unpaid interest, if any, to, the date of redemption (the
"Redemption Date") (subject to the right of Holders of record on the relevant
record date to receive interest due on the relevant interest payment date).

     "Applicable Premium" means, with respect to a Security at any Redemption
Date, the greater of (i) 1.0% of the principal amount of such Security and (ii)
the excess of (A) 

                                      B-5

 
the present value at such time of (1) the redemption price of such Security at
May 1, 2003 (such redemption price being described under "Optional Redemption")
plus (2) all required interest payments due on such Security through May 1,
2003, computed using a discount rate equal to the Treasury Rate plus 50 basis
points, over (B) the principal amount of such Note.

     "Treasury Rate" means the yield to maturity at the time of computation of
United States Treasury securities with a constant maturity (as compiled and
published in the most recent Federal Reserve Statistical Release H.15 (519)
which has become publicly available at least two business days prior to the
Redemption Date (or, if such Statistical Release is no longer published, any
publicly available source of similar market data)) most nearly equal to the
period from the Redemption Date to May 1, 2003; provided, however, that if the
period from the Redemption Date to  May 1, 2003 is not equal to the constant
maturity of a United States Treasury security for which a weekly average yield
is given, the Treasury Rate shall be obtained by linear interpolation
(calculated to the nearest one-twelfth of a year) from the weekly average yields
of United States Treasury securities for which such yields are given, except
that if the period from the Redemption Date to May 1, 2003 is less than one
year, the weekly average yield on actually traded United States Treasury
securities adjusted to a constant maturity of one year shall be used.

     In the case of any partial redemption, selection of the Securities for
redemption will be made by the Trustee on a pro rata basis, by lot or by such
other method as the Trustee in its sole discretion shall deem to be fair and
appropriate, although no Securities of $1,000 in original principal amount or
less will be redeemed in part. If any Security is to be redeemed in part only,
the notice of redemption relating to such Security shall state the portion of
the principal amount thereof to be redeemed. A new Security in principal amount
equal to the unredeemed portion thereof will be issued in the name of the holder
thereof upon cancellation of the original Security.

6.   Repurchase Provisions
     ---------------------

          1.  Upon a Change of Control, unless the Company has exercised its
right to redeem the Securities as described under Section 5 hereof, any Holder
of Securities will have the right to cause the Company to repurchase all or any
part of the Securities of such Holder at a purchase price in cash equal to 101%
of the principal amount thereof, plus accrued and unpaid interest, if any, to
the date of repurchase (subject to the right of Holders of record on the
relevant record date to receive interest due on the relevant interest payment
date) as provided in, and subject to the terms of, the Indenture.

              (b)  If the Company or a Restricted Subsidiary consummates any
Asset Sales permitted by the Indenture, when the aggregate amount of Excess
Proceeds equals or exceeds $5.0 million, the Company shall make an Offer for all
outstanding Securities pro rata up to a maximum principal amount (expressed as a
multiple of $1,000) of Securities equal to such Excess Proceeds, at a purchase
price in cash equal to 100% of the principal amount thereof, plus accrued and
unpaid interest

                                      B-6

 
thereon, if any, to the date of purchase in accordance with the procedures set
forth in Section 3.7 of the Indenture.
         -----------                  

7.   Subordination
     -------------

     The Securities are subordinated to Senior Indebtedness and the Note
Guarantees are subordinated to Guarantor Senior Indebtedness, each as defined in
the Indenture. To the extent provided in the Indenture, Senior Indebtedness must
be paid before the Securities may be paid. The Company agrees, and each
Securityholder by accepting a Security agrees, to the subordination provisions
contained in the Indenture and authorizes the Trustee to give them effect and
appoints the Trustee as attorney-in-fact for such purpose. The Securities will
in all respects rank pari passu with all other Senior Subordinated Indebtedness.

8.   Denominations; Transfer; Exchange
     ---------------------------------

     The Securities are in registered form without coupons in denominations of
principal amount of $1,000 and whole multiples of $1,000.  A Holder may transfer
or exchange Securities in accordance with the Indenture.  The Registrar may
require a Holder, among other things, to furnish appropriate endorsements or
transfer documents and to pay any taxes and fees required by law or permitted by
the Indenture.  The Registrar need not register the transfer of or exchange (i)
any Securities selected for redemption (except, in the case of a Security to be
redeemed in part, the portion of the Security not to be redeemed) or for a
period beginning 15 days before the mailing of a notice of Securities to be
redeemed and ending on the date of such mailing or (ii) any Securities for a
period beginning 15 days before an interest payment date and ending on such
interest payment date.

9.   Persons Deemed Owners
     ---------------------

     The registered holder of this Security may be treated as the owner of it
for all purposes.

10.  Unclaimed Money
     ---------------

     If money for the payment of principal or interest remains unclaimed for two
years, the Trustee or Paying Agent shall pay the money back to the Company at
its request unless an abandoned property law designates another person.  After
any such payment, Holders entitled to the money must look only to the Company
and not to the Trustee for payment.

11.  Defeasance
     ----------

     Subject to certain conditions set forth in the Indenture, the Company at
any time may terminate some or all of its obligations under the Securities and
the Indenture if the

                                      B-7

 
Company deposits with the Trustee money or U.S. Government Obligations for the
payment of principal and interest on the Securities to redemption or maturity,
as the case may be.

12.  Amendment, Waiver
     -----------------

     Subject to certain exceptions set forth in the Indenture, (i) the Indenture
or the Securities may be amended with the written consent of the Holders of at
least a majority in principal amount of the then outstanding Securities and (ii)
any default (other than with respect to nonpayment) or noncompliance with any
provision may be waived with the written consent of the Holders of a majority in
principal amount of the then outstanding Securities. Subject to certain
exceptions set forth in the Indenture, without the consent of any
Securityholder, the Company and the Trustee may amend the Indenture or the
Securities to cure any ambiguity, omission, defect or inconsistency, or to
comply with Article IV of the Indenture, or to provide for uncertificated
Securities in addition to or in place of certificated Securities, or to add
guarantees with respect to the Securities or to secure the Securities, or to add
additional covenants or surrender rights and powers conferred on the Company or
Communications or to comply with any request of the SEC in connection with
qualifying the Indenture under the Act, or to make any change that does not
adversely affect the rights of any Securityholder, or to provide for the
issuance of Exchange Securities.

13.  Defaults and Remedies
     ---------------------

     Under the Indenture, Events of Default include (i) default for 30 days in
payment of interest when due on the Securities; (ii) default in payment of
principal on the Securities at maturity, upon required repurchase, upon required
repurchase or upon redemption pursuant to paragraphs 5 and 6 of the Securities,
upon declaration or otherwise; (iii) the failure by the Company to comply with
its obligations under Article IV of the Indenture (iv) failure by the Company to
                      ----------                                                
comply for 30 days after notice with any of its obligations under the covenants
described under Section 3.9 of the Indenture or under other covenants specified
                -----------                                                    
in the Indenture (in each case, other than a failure to purchase Securities,
which shall constitute an Event of Default under clause (ii) above), (v) the
failure by the Company to comply for 60 days after notice with its other
agreements contained in the Indenture, (vi) Indebtedness of the Company or any
Restricted Subsidiary if not paid within any applicable grace period after final
maturity or is accelerated by the holders thereof because of a default and the
total amount of such Indebtedness unpaid or accelerated exceeds $5.0 million
(the "cross acceleration provision"), (vii) certain events of bankruptcy,
insolvency or reorganization of the Company or a Significant Subsidiary (the
"bankruptcy provisions"), (viii) any judgment or decree for the payment of money
in excess of $5.0 million is rendered against the Company or a Significant
Subsidiary and such judgment or decree shall remain undischarged or unstayed for
a period of 60 days after such judgment becomes final and non-appealable (the
"judgment default provision") or (ix) any Note Guarantee ceases to be in full
force and effect (except as contemplated by the terms of the Indenture) or any

                                      B-8

 
Guarantor denies or disaffirms its obligations under the Indenture or its Note
Guarantee.  However, a default under clauses (iv) and (v) will not constitute an
Event of Default until the Trustee or the holders of more than 25% in principal
amount of the outstanding Securities notify the Company of the default and the
Company does not cure such default within the time specified in clauses (iv) and
(v) hereof after receipt of such notice.

     If an Event of Default occurs and is continuing, the Trustee or the Holders
of at least 25% in principal amount of the Securities may declare all the
Securities to be due and payable immediately. Certain events of bankruptcy or
insolvency are Events of Default which will result in the Securities being due
and payable immediately upon the occurrence of such Events of Default.

     Securityholders may not enforce the Indenture or the Securities except as
provided in the Indenture. The Trustee may refuse to enforce the Indenture or
the Securities unless it receives reasonable indemnity or security. Subject to
certain limitations, Holders of a majority in principal amount of the Securities
may direct the Trustee in its exercise of any trust or power. The Trustee may
withhold from Securityholders notice of any continuing Default or Event of
Default (except a Default or Event of Default in payment of principal or
interest) if it determines that withholding notice is in their interest.

14.  Trustee Dealings with the Company
     ---------------------------------

     Subject to certain limitations set forth in the Indenture, the Trustee
under the Indenture, in its individual or any other capacity, may become the
owner or pledgee of Securities and may otherwise deal with and collect
obligations owed to it by the Company or its Affiliates and may otherwise deal
with the Company or its affiliates with the same rights it would have if it were
not Trustee.

15.  No Recourse Against Others
     --------------------------

     An incorporator, director, officer, employee, stockholder or controlling
person, as such, of the Company shall not have any liability for any obligations
of the Company under the Securities or the Indenture or for any claim based on,
in respect of or by reason of such obligations or their creation.  By accepting
a Security, each Securityholder waives and releases all such liability.  The
waiver and release are part of the consideration for the issue of the
Securities.

16.  Authentication
     --------------

     This Security shall not be valid until an authorized signatory of the
Trustee (or an authenticating agent acting on its behalf) manually signs the
certificate of authentication on the other side of this Security.

                                      B-9

 
17.  Abbreviations
     -------------

     Customary abbreviations may be used in the name of a Securityholder or an
assignee, such as TEN COM (=tenants in common), TEN ENT (=tenants by the
entirety), JT TEN (=joint tenants with rights of survivorship and not as tenants
in common), CUST (=custodian) and U/G/M/A (=Uniform Gift to Minors Act).

18.  CUSIP Numbers
     -------------

     Pursuant to a recommendation promulgated by the Committee on Uniform
Security Identification Procedures the Company has caused CUSIP numbers to be
printed on the Securities and has directed the Trustee to use CUSIP numbers in
notices of redemption as a convenience to Securityholders. No representation is
made as to the accuracy of such numbers either as printed on the Securities or
as contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

19.  Governing Law
     -------------

     This Security shall be governed by, and construed in accordance with, the
laws of the State of New York but without giving effect to applicable principles
of conflicts of law to the extent that the application of the laws of another
jurisdiction would be required thereby.

                                     B-10

 
                                ASSIGNMENT FORM

To assign this Security, fill in the form below:

I or we assign and transfer this Security to

             (Print or type assignee's name, address and zip code)

                 (Insert assignee's soc. sec. or tax I.D. No.)

and irrevocably appoint                 agent to transfer this Security on the
books of the Company.  The agent may substitute another to act for him.


_______________________________________________________________________________ 

Date: _______________  Your Signature ____________________

Signature Guarantee:  ____________________________________
                             (Signature must be guaranteed)


_______________________________________________________________________________ 
Sign exactly as your name appears on the other side of this Security.

The signature(s) should be guaranteed by an eligible guarantor institution
(banks, stockbrokers, savings and loan associations and credit unions with
membership in an approved signature guarantee medallion program), pursuant to
S.E.C. Rule 17Ad-15.

                                     B-11

 
                      OPTION OF HOLDER TO ELECT PURCHASE


     If you want to elect to have this Security purchased by the Company
pursuant to Section 3.7 or 3.9 of the Indenture, check either box:
            -----------    ---                                    

                                   [_]  [_]
                                   3.7  3.9


     If you want to elect to have only part of this Security purchased by the
Company pursuant to Section 3.7 or 3.9 of the Indenture, state the amount in
                    -----------    ---                                      
principal amount (must be integral multiple of $1,000): $


Date: _______________   Your Signature: _________________________
                        (Sign exactly as your name appears on the other side of
                         the Security)



Signature Guarantee: _______________________________________
                         (Signature must be guaranteed)

The signature(s) should be guaranteed by an eligible guarantor institution
(banks, stockbrokers, savings and loan associations and credit unions with
membership in an approved signature guarantee medallion program), pursuant to
S.E.C. Rule 17Ad-15.

                                     B-12