Quote Originally Posted by Fursphere
Yup.

As soon as you reach the edge of the "full screen" WoW, it'll kick over to next computer.

The only thing about synergy is that on the secondary computers, mouselook control in WoW (its fine in Windows/Linux/etc) goes haywire.
You resolve that issue by hitting Scroll Lock and set the relative mouse movements option in Synergy. A little pain in the ass but it's free, so it's hard to complain. Is there an alternative to Synergy that doesn't make the mouse go haywire? I'd love to try it out if there is one.