Generally agree. Although I suppose most aren't trying to achieve 100%, but as close to it as is practical. I'm sure DeepFreeze'ing a computer and never shutting it off would come very close to being 100% secure (would only not be if a flaw was found in it)...but it wouldn't be practical. edit : secure, as in, no nasties would stay on it. Not 'secure' as in, nasties couldn't temporarily stay onboard until next reboot.