MUSH is an acronym which stands for Multiple User Shared Hallucination.  A MUSH is a virtual world in which people may interact in real time with each other, usually playing out roles based on themes from books or movies.  My wife and I run OneRing Mush at tangled.floop.com 9876. It is a Hobbit-theme mush, set in Middle Earth at the end of “The Hobbit”, by J.R.R. Tolkien. It's web page can be found at OneRing Mush Homepage at http://www.floop.com/tangled.html.  You can connect from there. Another of my favorites is Elendor, a MUSH based on the works of J.R.R. Tolkien.  My character there these days is Rhys.  Elendor can be found at the Elendor MUSH Homepage at http://www.sitr.on.ca/elendor/.  You can connect from there.