I'm Just Going to Hang Out Until You Press F1.

SMM has surprisingly old origin. When Packard Bell PCs, when running DOS or Windows 3.1, you could hit Alt S to go into the Packard Bell BIOS setup. I don't know if this is SMM or just the BIOS hanging around and and and butting in where maybe it shouldn't. This was a school computer. So I didn't have like any games installed on it that I could see used to probe the limits of this function. But that's where it could and couldn't run.