Windows 7 and number of protection rings they use [closed]

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How many protection rings do the Windows 7 use? I know that Windows XP and previous used only ring 0 and ring 3.

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That hasn't changed. IIRC, OS/2 was the only commercial OS to use the other privilege levels. Having four privilege levels is not portable across multiple CPU architectures, so it is unlikely that a portable OS kernel such as NT would ever use more than two of them.