To build a multiseat Linux workstation, multiple terminals running off of the same computer.

Wikipedia - Multiseat Configuration

Wouldn't it be nice to be able to turn the lone computer in your house to two, three, or more computers? A multiseat workstation is just that, one computer interfaced with multiple monitors, keyboards, and mice. Then you wouldn't have to worry about sharing. :) Under standard configurations, only one person would normally be able to use the computer at a time. However, with the multiseat configuration any unused resources on the computer could be used by someone else.

I would start by looking through youtube for various tutorial videos and demonstrations of a multiseat stations. Also begin with reading through the ubuntu multiseat documentation. As of right now, I'm not on a machine that has dual display, I skipped over checking the display in the tutorial. I moved onto checking the input devices.

ubuntu:/$ ls /dev/input/mouse*

I followed that with

ubuntu:/$ cat /proc/stat/bus/input/devices

The first command will give you the location of the mouse and the second command will check for keyboard locations and information.

Multiseat How-to

Multiseat References

Ubuntu Multiseat Documentation