One of the oldest and most famous still-running MUDs on the Internet, LambdaMOO went online in late 1990. MUDs (multi-user dungeon) and MOOs (MUD, object oriented) are computer programs that allow multiple users to connect from remote locations and to both interact with the program and communicate with each other. Once connected to a MUD, participants must log on as a “character” on that MUD. They then type text to the program and receive responses from the program and from other users. Pavel Curtis, who in 1990 was a programmer at Xerox Palo Alto Research Center (PARC), used a heavily revised version of the original MOO code developed earlier that year by Stephen White to create the LambdaMOO environment. (The program itself is also called LambdaMOO, and many other MOOs use some version of this program.) The opening of LambdaMOO was announced in early 1991 on the Usenet newsgroup rec.games.muds, ...