CVar gxMonitor

This CVar controls which monitor wow plays on. Doesn't really matter for single monitor users, but handy for multi-monitor users.

Default Setting
0

Possible Settings

 * 0:Only monitor for single-monitor users, 1st monitor (per Windows) for multi-monitor users
 * 1:2nd Monitor (per Windows) for multi-monitor users

Changing this setting
In-game, type the following /console gxMonitor setting

Alternatively, you can exit wow, open the Config.wtf file, and add the following line: SET gxMonitor setting

Tricks
You can get World of Warcraft to play in a Windowed (Full Screen) mode on multiple monitors using this in macros. Performance may drop dramatically depending on your system and monitor sizes. Examples below:

/console gxWindow 1 /console gxMaximize 1 /console gxMonitor 1 /console gxrestart
 * Monitor 1

/console gxWindow 1 /console gxMaximize 1 /console gxMonitor 2 /console gxrestart
 * Monitor 2