MUD ( Multi -User Domain ) or ( Multi-User Dimension )
An online interactive computer game or exploration medium.Early MUDs were Dungeons&Dragons-like games in text-only forms,but they have grown into many other forms,too.They are now used for social gatherings,interactive learning,chat rooms,and much more,as well as the old-style entertaining games.Originally accessible only through telnet,many of them have migrated to the web,and even appeared in graphical virtual reality and 3D forms.Variations are known as MUSHes,MUSEs, and MOOs.For specific examples,see Delphis selective DRAGONet Multi-User page and for more links,see Yahoos list of links to MUDs,MUSHes,MOOs,etc.