[botmeister]

Yes it looks like I can add binding to a specific cpu. If I find the time, I'll give it a try. In case you did not know, the source code is available for modifications if you have the skills (and time).

This system call should do the trick
SetProcessAffinityMask(ProcessInfo.hProcess, BitMask);

I knew about the "fast user switch". It just keeps the previous user logged in. Under windows 2000 there's no such thing however, so you need Windows XP or higher.

I tried a lot of different things, but I found nothing that kept the processes running after a log out.