Are you one of those people who likes to switch back and forth between Windowed and Full-Screen mode? I know I am. I like to use Windowed mode while soloing, so I can surf the net, watch my newsfeeds, and put on a little DS9. But when it's time for dungeons or PvP, I prefer Fullscreen because it gives me better framerates.
You can go in to the Options menu and do it, or you can just use this handy macro. Click it once and it'll switch you to whichever mode you're not already in. Pretty handy.
/script SetCVar("gxWindow",1-GetCVar("gxWindow")) RestartGx()