>It's going to work like a dual processor machine. The VFP app will only run on one core.

Yes - but still during the run the process can switch over to the other core.
As I employ Queryperformance* for my timing routines and this might be problematic, see:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/timers/timerreference/timerfunctions/queryperformancecounter.asp
I'ld like to fence the app onto the *same* single core for the whole run.

regards

thomas