SpaceFox MUCK (SFM) has relatively few odd specifics about it (at the present time anyway) and few reasons to build stuff.
However, if you do want to build something, we highly recommend our snazzy 'editroom' command!
The MUCK uses a global 'watchfor' list. Anyone who connects or disconnects notifies the entire MUCK, rather than having individual watch for lists like most MUCKs.
Deeper Information