Quote Originally Posted by Archchancellor View Post
You can reply to a GM when in a instance. The only thing is when they talk to you because you are in a instance whatever they say to you will be duplicated in your chat log. I think it happens because they are talking to you from outside the instance.
All "group" chat in the game is a side channel that is independent of the instance. Alliances, Party chat, Linkshells, FC, and Mentor channel are all this. GM's likely communicate with you on a "system message" channel if they can not spawn a GM character nearby you.