I don't think (I could be wrong) that you can do this.

Your first problem is that you would need to have two inputs for keyboard, and 2 inputs for mice.
The next problem is that the computer would need to figure out what device was supposed to work on what application.
The next problem is, if you use Maximizer with KeyClone on one PC, the window you click on will have "focus" and commands will be sent to that window.

Just my thoughts.