Using Multiple Keyboard/Mice on single Mac Pro

Hi Folks,
I've tried to search this topic, with no joy.
Basically, I would like to run a Mac Pro with dual monitors, and 2 users, working simultaneously. In this app, I would like each user to be able to run applications on their own screen and use separate Keyboard/Mouse for the applications on their separate screens. The screens would run as an extended desktop, but the applications on each screen would need to recognize their designated I/O (Keyboard/Mouse) device.
I see plenty about running 2 systems with 1 keyboard/mouse... but not the other way around.
Has anyone come across this mode of operation before, I am sure it is possible to do.... but would have to be some software behind it, so that the data streams from the proper I/O makes it to the proper application, even when multiple windows of the same app may be running simultaneously (like 2 windows of Safari).
Any thoughts?
Dual G4, 17" PB G4 Mac OS X (10.4.9)

To give a bit of background behind my interest.
I homeschool my 2 children, and am looking to purchase a new Mac. In dual monitor mode, I see the possiblity to limit my purchase to one system, where each user is able to have their own monitor and I/O control. An additional advantage is that in Mirror monitor mode, I can control the system, while they are able watch a lesson. Using this method, I would purchase a higher power system which provides my kids plenty of power, even when they are both using the system, and gives me a higher power system when I use it by myself (sort of like a super-user). Basically the best of both worlds, and the actual price resides around the cost of 2 independent systems, but gives me a high power system for other activities.
I can envision a lot of applications for such activities. Some I could see in a networked environment. I am actually surprized we have not seen any office applications go to the model of multi-player gaming, where many users can work on the same document simultaneously. There are of course database applications which operate in this manner, but I am not aware of any productivity apps.
Dual G4, 17" PB G4 Mac OS X (10.4.9)

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