>I think all it does is enable/disable the ability for the screen saver to "kick-in". Screen savers could suck away a lot of the available processor time, so if you had a length process running and the screen saver kicked-in, it might take a long while to complete vs just letting your process just run without interference from the screen saver.

And - on low memory system (64MB) - it can sometimes lock up the VFP IDE!