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Is there a definitive reference of all of the Windows shortcut keys along with which operating systems they apply to?

For example, we all know about Ctrl + Alt + Delete, but I've met quite a few people that don't know about Windows + L to lock the computer in Windows XP and up.

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None of the answers so far list the new Windows 7 keyboard shortcuts, such as Win+Up to maximize the current window. – Kris Peters Nov 14 '11 at 16:24
up vote 8 down vote accepted

I doubt there's a full one anywhere, since programs can make up their own, but this Microsoft one is pretty good.

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Here's a rather long list from the Microsoft support website for Windows XP.

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