When users "do" the ubicomp

Abstract

ing with credit is permitted. To copy otherwise, to republish, to post on servers, or to redistribute to lists, requires prior specific permission and/or fee. Request permission to publish from: Publications Dept., ACM, Inc., Fax [phone] or email [e-mail] For other copying of articles that carry a code at the bottom of the first or last page or screen display, copying is permitted provided that the per-copy fee indicated in the code is paid through the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, [phone], [phone] (fax). A BIMONTHLy PUBLICATION OF ACM in te ra c ti o n s M a rc h + A p ri l 2 0 0 8