ACM Copyright Form TITLE OF WORK: AUTHOR(S): Conference Name/Date: CHI 98, April 18-23, 1998, Los Angeles, California, USA A. TRANSFER OF COPYRIGHT AGREEMENT Copyright to the above work (including without limitation, the right to publish the work in whole or in part in any and all forms of media, now or hereafter known) is hereby transfered to the ACM (for U.S. Government work, to the extent transferrable*) effective as of the date of this agreement on the understanding that the work has been accepted for publication by ACM. However, each of the Authors retain the following rights: (1) All other proprietary rights except copyright (and the publication rights transferred to ACM), such as patent rights. (2) The right to reuse, without fee, in future works of the Author's own provided that the ACM citation and Copyright notice are included. 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