What is MPX? Well according to wikipedia MPX is a modification to the existin X.Org implemantation of the X Windows System. MPX provides multiple independent pointers at the window system level. These cursors are all connected to one computer. Unlike many other multi-pointer applications and toolkits, MPX allows many existing X Window applications to run unmodified, while still providing additional input features.
Now that you have a little ide of what MPX is you can see it in action with Conpiz Fusion which makes it more fun. Take a look at,
here is another link for another video I hope you enjoy it. CHeers!