"Sdi was designed and coded by Mark Weiser\nwhile at the University of Maryland.\nIf you like sdi, send mark a picture postcard at:\n Mark Weiser\n Computer Science Laboratory\n Xerox Palo Alto Research Center\n 3333 Coyote Hill Rd.\n Palo Alto, California 94304\n (Email: mark@mimsy.umd.edu)"
