Diku and most (all?) other MUDs were "BSD" socket-based. Windows did not even ship with a sockets layer (winsock) until 1994, with Windows NT 3.5, and it made its way to consumers with Windows 95.
Merc did allow for compiling on Mac and MS-DOS, but in this mode reads and writes to the console, without a socket implementation. No multiplayer.
Merc did allow for compiling on Mac and MS-DOS, but in this mode reads and writes to the console, without a socket implementation. No multiplayer.
See: https://github.com/alexmchale/merc-mud/blob/master/src/comm....