One PC, multiple users at the same time? Quite possible, on Linux Operating System.
After walking down the memory lane, I remembered that Linux was really capable of going multi-user. I was not sure if I have seen this on sci-fi movies or from a digest. So I run some search and I actually found a draft on this multi-user configuration, one was based on Mandriva, the other Ubuntu.
I am planning to write a concise article on this, but because I haven’t have the time or the resources to emulate the situation, I’ll just give you the direct links to the draft article:
I’m also including the full-text file download in case the original site went down: