Exhibit 99.4

                               PENTON MEDIA, INC.
                          EXCHANGE OF ALL OUTSTANDING
                     11 7/8% SENIOR SECURED NOTES DUE 2007
                                      FOR
                     11 7/8% SENIOR SECURED NOTES DUE 2007

THE EXCHANGE OFFER WILL EXPIRE AT 5:00 P.M., NEW YORK CITY TIME, ON
                   , 2002 UNLESS EXTENDED (THE "EXPIRATION DATE"). NOTES
TENDERED IN THE EXCHANGE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO 5:00 P.M.,
NEW YORK CITY TIME, ON THE EXPIRATION DATE.

To Our Clients:

         We are enclosing herewith a prospectus, dated                , 2002, of
Penton Media, Inc., and the accompanying letter of transmittal that together
constitute the offer by Penton (the "Exchange Offer"), to exchange its 11 7/8%
Senior Secured Notes due 2007 (the "Exchange Notes"), which have been registered
under the Securities Act of 1933 (the "Securities Act"), for a like principal
amount of its issued and outstanding 11 7/8% Senior Secured Notes due 2007 (the
"Outstanding Notes"), upon the terms and subject to the conditions set forth in
the Exchange Offer.

         The Exchange Offer is not conditioned upon any minimum number of
Outstanding Notes being tendered.

         We are the holder of record of Outstanding Notes held by us for your
own account. A tender of such Outstanding Notes can be made only by us as the
record holder and pursuant to your instructions. The letter of transmittal is
furnished to you for your information only and cannot be used by you to tender
Outstanding Notes held by us for your account.

         We request instructions as to whether you wish to tender any or all of
the Outstanding Notes held by us for your account pursuant to the terms and
conditions of the Exchange Offer. We also request that you confirm that we may,
on your behalf, make the representations contained in the letter of transmittal.

         Pursuant to the letter of transmittal, each holder of Outstanding Notes
will represent to Penton that:

         (i) any Exchange Notes that the holder will acquire in exchange for
         Outstanding Notes that the holder has tendered will be acquired in the
         ordinary course of business of the holder,

         (ii) the holder has not engaged in, does not intend to engage in, and
         has no arrangement or understanding with any person to participate in,
         a distribution of any Exchange Notes issued to the holder, and

         (iii) the holder is not an "affiliate" (as defined in Rule 405 under
         the Securities Act) of Penton Media, Inc.

         If the holder is a broker-dealer that will receive Exchange Notes for
its own account in exchange for Outstanding Notes that were acquired as a result
of market-making activities or other trading activities, it will acknowledge
that it will deliver a prospectus in connection with any resale of the Exchange
Notes. However, by this acknowledgement and by delivering a prospectus, the
broker-dealer will not be deemed to admit that it is an "underwriter" under the
meaning of the Securities Act.

         Please return your instructions to us in the enclosed envelope within
ample time to permit us to submit a tender on your behalf prior to the
Expiration Date.







                                 INSTRUCTION TO
                         BOOK ENTRY TRANSFER PARTICIPANT

To Participant of the DTC:

         The undersigned hereby acknowledges receipt of the prospectus, dated
                , 2002 (the "prospectus") of Penton Media, Inc., and the
accompanying letter of transmittal, that together constitute Penton's offer (the
"Exchange Offer") to exchange its 11 7/8% Senior Secured Notes due 2007 (the
"Exchange Notes"), for all of its outstanding 11 7/8% Senior Secured Notes due
2007 (the "Outstanding Notes"). Capitalized terms used but not defined herein
have the meanings ascribed to them in the prospectus or the letter of
transmittal.

         This will instruct you, the DTC participant, as to the action to be
taken by you relating to the Exchange Offer with respect to the Outstanding
Notes held by you for the account of the undersigned.

         The aggregate face amount of the Outstanding Notes held by you for the
account of the undersigned is (FILL IN AMOUNT):

         $_______ of the 11 7/8% Senior Secured Notes due 2007.

         With respect to the Exchange Offer, we hereby instruct you (CHECK
APPROPRIATE BOX):

         [ ] To TENDER the following amount of Outstanding Notes you hold for
         our account (INSERT PRINCIPAL AMOUNT OF OUTSTANDING NOTES TO BE
         TENDERED, IF ANY):

                  $-------.

         [ ] NOT TO TENDER any Outstanding Notes you hold for our account.

         If we instruct you to tender the Outstanding Notes held by you for our
account, it is understood that you are authorized to make, on behalf of us (and,
by signing below, we hereby make to you), the representations contained in the
letter of transmittal that are to be made with respect to us as a beneficial
owner, including, but not limited to, the representations, that:

         (i) any Exchange Notes that the holder will acquire in exchange for
         Outstanding Notes that the holder has tendered will be acquired in the
         ordinary course of business of the holder,

         (ii) the holder has not engaged in, does not intend to engage in, and
         has no arrangement or understanding with any person to participate in,
         a distribution of any Exchange Notes issued to the holder, and

         (iii) the holder is not an "affiliate" (as defined in Rule 405 under
         the Securities Act) of Penton Media, Inc.

         If we are a broker-dealer that will receive Exchange Notes for our own
account in exchange for Outstanding Notes that were acquired as a result of
market-making activities or other trading activities, we acknowledge that we
will deliver a prospectus in connection with any resale of the Exchange Notes.
However, by this acknowledgement and by delivering a prospectus, we are not be
deemed to admit that we are an "underwriter" under the meaning of the Securities
Act.



Name of beneficial owner(s):
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Signature(s):
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Name(s) (please print):
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Address:
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Telephone Number:
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Taxpayer Identification or Social Security Number:
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Date:
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