Hey Robert,
I'm not sure exactly what you are asking. I have a dedicated PC for Mach, nothing else except windows. This is the PC that has the parallel port connections that go to my breakout board, push buttons, mpg,etc. I have added Screenhunter to it with no sign of trouble. I do everthing else on another PC. E-mail, surfing the web, drawing, accounting, etc. I have seen PCs with Mach and everything else, cad, cam, e-mail, drawing programs, etc. that ran just fine but it is not recommended. I feel good about the setup and peace of mind means a lot.
Hope this helps
Brett