When you look at HKEY_USERS registry key, each subkey (representing each user's settings) looks something like S-1-5-18 which is called SID I guess.

How do I know which SID is for which user account?

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How to Associate a Username with a Security Identifier (SID)

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And here's a summary of all the main system SIDs support.microsoft.com/kb/243330 – Rhys Gibson Jan 11 '11 at 19:43
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One can use PsGetSid also.

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