"Sdi was initially designed and coded by Mark Weiser in 1987 while at the University of Maryland.\nThis version was adopted by Mark in July and August 1991 to run in X using XView, and to be more colorful.\nIf you like sdi, please 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: weiser@xerox.com)"