Split Screen, 2 active users

Hi All,

I was wondering whether it is possible to have two users simultaneously active using a split screen setup. Ie, User 1 is on screen 1 and user 2 is on screen two, and if I move the mouse left to right I can control one or the other. It's convenient for me to run two instances of a program using two different users, but I'd like to avoid the constant switching back and forth between users to check how each is doing.

-Nikolai