License: He has placed the code under this license: http://www.gammon.com.au/forum/?id=7744
Description: MUSHclient ... FreeWare MUD client
Other: Not sure on the registry entries. Will post again when I find out more.
Nick Gammon recently opened the source of MUSHclient. The source code is availible at: http://www.gammon.com.au/files/mushclient/src/ The most recent version is 4.18. I'm trying to talk Nick into making the client portable, but not sure how far I'll get.
If you have anymore question, I'll answer the best I can.