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I'm certain I'm not making this up. Quite often I'll notice something is taking longer than it should (a Visual Studio build, some unresponsive app, web page load or whatever). I'll hit crtl+shift+esc to open up Process Explorer to see what's going on. But the instant I press the keys, the hanging app starts responding and finishes what it's doing.
Normally I'd think this is coincidence, but it happens so often (and on several machines) that it's made me curious; could something be causing this behaviour? If so, perhaps I should write a program that just launches Process Explorer repeatedly to improve performance!
I dunno about your specific key combination, but I know (at least sometime in the past) Ctrl-Alt-Del cleared... Something from memory. I don't remember exactly what, but if I remember correctly, that was the reason why most logins require you to hit those keys to get to the login screen... I'm not sure if it still acts the same way anymore, but when my system starts getting funky and locking up, I give it the three-fingered salute and the problem appears to go away... Whether it's placebo or not, it makes me feel better :) – Taegost – 2013-07-23T15:42:03.913