... Xerox Palo Alto Research Center, 3333 Coyote Hill Rd., ... We describe our experiment with an on-line collaborative environment where users share the execution of programs and communicate via audio, video, and typed text. ... Our idea was to build a multi-user, network-accessible environment which we could populate with tools useful for astrophysics research. ... These client-server games were usually written by graduate and undergraduate students, and plain telnet was often the client. ...