You drag a tab onto the screen. For example you can drag the systems tab or the public tab off the chat window to make a new window with that particular chat.
Drag a tab back onto another window to leave it there as a tab.
i have 2 chat windows with a few tabs each my ca is almost always the one open on the left and the right one has system always up no need for anything else really unless u need to monitor clan chat but our c chat is so dead lately your lucky if someone talkes every 15mins heh