[KaVir]

There are quite a few MUD protocols, with different degrees of standardisation, used by dozens if not hundreds of MUDs (and supported by the major clients). I actually created a snippet for the protocols I consider worth using (the only one I left out which I'd consider important is MCCP2) - see for details. I also wrote an article about using protocols to enhance the user interface in the last issue of Imaginary Realities, which you can read .