I know it won't work with a USB mouse, But could one splice a PS/2 mouse, and get the effect your after? Simply match each wire, to two (or more) PS/2 ends. With a USB, I believe it doesn't work, due to it picking up as a serial input or something. Sorry just woke up and brain is all foggy.

And dang it, I forgot to post that macro, I'll get on it tonight to see if that helps you at all. Also, Ualaa and John are correct, as far as the easiest means to do so. One way to look at at software boxing, is all it does, is remove windows ability to keep said key presses and mouse movements to one window. Doesn't effect WoW or other games at all. The only other thing I could think of would be some kind of KVM switch, but then your talking easily spending some big money.

Stephen