I myself, as a vendor/buyer need to have 3 chat windows, as one, I fine myself needing to see the guild/personal chat, and also need to view the trade chat (peer/world) I split them up so that it doesnt bother me, however this leaves out my system and other useful system printed messages like exp/cp and drops. But since we're stuck with two, I moved my system chat in to my personal chat, and lets say when lag hits and I'm sturm running, I see <System> Action failed. You're dead. x 25 thus removing any kind of chat i miss from my personal chat which may include selling/buying or guild help. And I could change the chat windows everytime i need it to show something different, but I find that too hard, and usually I find the best things to buy in the middle of my run.