Originally Posted by Sephiroth
-You can assign things such as All Chat, Guild Chat, Buddy Chat, and Party chat to keys to save you from manually clicking them with the mouse or typing "/g" "/b" "/p", etc.
I went to hotkey them like WoW that I'm used to and it and I like it, but it doesn't accept more than one character, so you can't do /g, only /.
You probably set a key to it and you don't type a command, you hit your hotkey, like NumLock for guild and your chat bar automatically opens to guild. Didn't test, but if they don't allow more than one character for commands, it's probably safe to assume it's the latter that I've mentioned.