If you are watching a protein fold on a black background, then you can close it and a red flower will appear in the system tray by the clock.
F@H will run when your system is idle.
If you ran the console version then you will have a DOS text box full of geekspeak. Let it run overnight and lets see what the % completion is in the morning.
Be sure and turn off other screensavers so the two prograns don’t compete for CPU time.
I don’t run a screensaver.
I’m running the DOS version of it I guess.