REGISTRATION RIGHTS AGREEMENT



                          ADVANSTAR COMMUNICATIONS INC.



                                    as Issuer



                    APPLIED BUSINESS TELECOMMUNICATIONS, INC.

                     MEN'S APPAREL GUILD IN CALIFORNIA, INC.



                                  as Guarantors









                                  $160,000,000

                     12% SENIOR SUBORDINATED NOTES DUE 2011



                          Dated as of February 21, 2001



                               -------------------





                     CREDIT SUISSE FIRST BOSTON CORPORATION,

             AS THE REPRESENTATIVE OF THE SEVERAL INITIAL PURCHASERS









================================================================================





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      This Registration Rights Agreement (this "AGREEMENT") is made and entered

into as of February 21, 2001, by and among Advanstar Communications Inc., a New

York corporation (the "COMPANY"), Applied Business teleCommunications, Inc., a

California corporation, and Men's Apparel Guild in California, Inc., a

California corporation (together, the "GUARANTORS"), and Credit Suisse First

Boston Corporation, as the representative of the several initial purchasers

(collectively, the "INITIAL PURCHASERS"), who have agreed to purchase the

Company's 12% Series A Senior Subordinated Notes due 2011 (the "SERIES A NOTES")

pursuant to the Purchase Agreement (as defined below).



      This Agreement is made pursuant to the Purchase Agreement, dated February

13, 2001 (the "PURCHASE AGREEMENT"), by and among the Company, the Guarantors

and the Initial Purchasers. In order to induce the Initial Purchasers to

purchase the Series A Notes, the Company has agreed to provide the registration

rights set forth in this Agreement. The execution and delivery of this Agreement

is a condition to the obligations of the Initial Purchasers set forth in Section

3 of the Purchase Agreement. Capitalized terms used herein and not otherwise

defined shall have the meaning assigned to them in the Indenture, dated February

21, 2001, among the Company, the Guarantors and Wells Fargo Bank Minnesota,

N.A., as Trustee (the "TRUSTEE"), relating to the Series A Notes and the Series

B Notes (the "INDENTURE").



      The parties hereby agree as follows:



SECTION 1.  DEFINITIONS



      As used in this Agreement, the following capitalized terms shall have the

following meanings:



      ACT:  The Securities Act of 1933, as amended.



      AFFILIATE:  As defined in Rule 144.



      AFFILIATED MARKET MAKER: A Broker-Dealer or one of its Affiliates who

is deemed to be an Affiliate of the Company.



      BROKER-DEALER: Any broker or dealer registered under the Exchange Act.



      CERTIFICATED SECURITIES: Definitive Notes, as defined in the Indenture.



      CLOSING DATE:  The date hereof.



      COMMISSION:  The Securities and Exchange Commission.



      CONSUMMATE: An Exchange Offer shall be deemed "Consummated" for purposes

of this Agreement upon the occurrence of (a) the filing and effectiveness under

the Act of the Exchange Offer Registration Statement relating to the Series B

Notes to be issued in the Exchange Offer, (b) the keeping of the Exchange Offer

open for a period not less than the period required pursuant to Section 3(b)

hereof and (c) the delivery by the Company to the Registrar under the Indenture

of Series B Notes in the same aggregate principal amount as the aggregate

principal amount of Series A Notes validly tendered and not withdrawn by Holders

thereof pursuant to the Exchange Offer.



      CONSUMMATION DATE: The date on which the Exchange Offer is Consummated.





{PAGE}



      CONSUMMATION DEADLINE: As defined in Section 3(b) hereof.



      EFFECTIVENESS DEADLINE: As defined in Sections 3(a) and 4(a) hereof.



      EXCHANGE ACT: The Securities Exchange Act of 1934, as amended.



      EXCHANGE OFFER: The exchange and issuance by the Company of a principal

amount of Series B Notes (which shall be registered pursuant to the Exchange

Offer Registration Statement) equal to the aggregate principal amount of Series

A Notes that are validly tendered and not withdrawn in connection with such

exchange and issuance.



      EXCHANGE OFFER REGISTRATION STATEMENT: The Registration Statement relating

to the Exchange Offer, including the related Prospectus.



      FILING DEADLINE: As defined in Sections 3(a) and 4(a) hereof.



      HOLDERS: As defined in Section 2 hereof.



      PROSPECTUS: The prospectus included in a Registration Statement at the

time such Registration Statement is declared effective, as amended or

supplemented by any prospectus supplement and by all other amendments thereto,

including post-effective amendments, and all material incorporated by reference

into such prospectus.



      RECOMMENCEMENT DATE: As defined in Section 6(d) hereof.



      REGISTRATION DEFAULT:  As defined in Section 5 hereof.



      REGISTRATION STATEMENT: Any registration statement of the Company and the

Guarantors relating to (a) an offering of Series B Notes pursuant to an Exchange

Offer or (b) the registration for resale of Transfer Restricted Securities

pursuant to the Shelf Registration Statement, in each case, (i) that is filed

pursuant to the provisions of this Agreement and (ii) including the Prospectus

included therein and all exhibits thereto.



      REGULATION S: Regulation S promulgated under the Act.

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