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It's not the same room, though. I logged in with AIM and with Trillian under two different screen names. Started the AIM room and then tried to join with Trillian. They both said "jetcareers" but I could not see myself. Though if I join the chat room under one name in AIM, then invite my Trillian screen name then I can join fine. Kinda weird.
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Joining already-existing chat rooms with trillian is quirky, to put it mildly. I've found that by initiating a chat invitation to someone else, you can just put your screen name in the invitees list along with the name of the room you want to join. This works.