I haven't seen any HOWTOs for tmux (I've thought about writing one), but as usual, the OpenBSD man page is very good, and thorough: <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=tmux" rel="nofollow">http://www.openbsd.org/cgi-bin/man.cgi?query=tmux</a>