One 1280x720 window docked to the upper right, one 1024x768 docked to the lower left, main on the upper right. I can move the minimap display with a mod so that I can track two things at once. It allows me to see both actionbars for cooldowns on both characters. Sometimes I alt-tab, sometimes I just click.

If I can get my software to play nice I can demonstrate this in video format. I'd use dual monitors but it's misbehaving randomly