One computer two users simultaneously?

Hi, I'll try to explain what i would find very usefull feature hopefully i can pull it out nicely and clear enougth. Also i am not programmer/coder so i do not know if the idea is possible at all.
So basic idea is to have only one computer and two users, doing their own tasks at
same time.
There would be two keyboards two monitors and two mouse all plugged to one mainboard, except monitor which would go to gfx card. When computer is powered on, both monitor would have their own login screen and the users could at any time they want login and start using the computer.
Now i thougth this is simple concept so i searched net all-over and under and found only few ideas bit close to this, and some places that would sell special equipment (very expensive) to do this, Mainly breaking the whole idea.
I'm already using seperate X's screens for my crt&tv-out configuration, i think that already is quite good. But i would like to make it one step futher, so i could basicly use the seperate screen totally as its own work unit, without it intefere at all to my crt screen.
The computers nowdays are quite powerfull this kind of tasks that two users would do something simple like surfing web doing some office stuff etc, should not require too much cpu power? Playing something like DOOM3 on both same time. would probably not work that smoothly.
I can think many good uses to that/this kind of system so i wont do pro's con's list.
Does anyone know if there already is this kind of system with easy method to do and not needing to use extra money if i already have all the hardware needed? Or is this
just simple impossible due hardware limitations?

Hey,
I believe it's possible. I've read about it a while ago I believe. You need to patch your Xserver I think. A good thing would to ask a question on the Xorg-list on this if you use Xorg, Xfree86, ... There is an irc-channel for xorg I believe.
I would first advice you to do the above thing(s) ...
Maybe I found a reference ...
Here is an extract from it:
There is a HOWTO at tldp.org. Look for XFree local multi-user.
The ruby (backstreet ruby for 2.4.x kernels) kernel patch allows interception of events from multiple keyboards to be bound to specific virtual terminals. The latest XFree and Xorg Xservers are now including this ability with the isolateDevice config file option. Older X servers need to be additionally patched. Basically, you craft an X config file to bind specific mice, graphics cards and monitors to their own screen layouts. Of course there is more to it than this. One accepted method is to alter the hotplug subsystem to automatically create your added devices, then you supply symlinks and binding instructions to the device addresses with config files. Keyboards are another matter. They are handled through the ruby patch. Using a 2.6.x kernel, the controlling terminal is assigned the use of virtual terminals 1-17. The next x screen is number 18, etc. The second keyboard, VT1, is automatically bound to the second x screen, VT18. This is of course oversimplified, and yes I've read that this method should work with up to 16 layouts!
What the multiseat package does I don't know. I will try it out this weekend. As far I have researched, it makes it easier to find and configure the several config files you need. If some one knows, please post.
I also foudn this link:
http://cambuca.ldhs.cetuc.puc-rio.br/multiuser/
Michel[/code]

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