Hmmm... might have to rethink this. I could always keep track of the rooms.
/msg #channel mytext worked fine. But not knowing the last active channel is the problem. Hmm.. maybe I could do an ON trigger to store the channel name. I just hoped there was a better way. Thanks. Food for thought.
(edit)
I found a way. Use $chan(x) to find the name of each channel I'm in. Of course, it won't store the last channel I *was* in, but it should work. Also, if I am logged onto two servers I can use $server to get the server names, then use that to access both servers' channels.