:)
> I'm wondering if Windows XP or Vista also supports it.
Yep, they do - you can specify /usepmtimer in boot.ini to force QPC to use it.
Quote:And that's the problem, it can be difficult for an application to determine if that is the case.
Never fear, that is taken care of by the code linked to above :) It even has a driver that reads the PM timer directly without requiring users to fiddle with boot.ini.