We demonstrate the Electronic Cocktail Napkin, a pen based interface for conceptual design. The project goal is to
support design by recognizing, interpreting, and managing drawings, and to serve as an interface for knowledge-based
critiquing, simulation, and information retrieval. We demonstrate the Napkin's facilities for end-user programmable
recognition and interpretation, drawing management, and multi-user collaboration. We show applications of the Napkin:
(1) indexing visual databases and (2) a front end to a local area network design program.