EXPERT RESPONSE
Several utilities exist that can convert user IDs to SIDs, such as the free Visual Basic program that can be downloaded from the document Retrieving a User's SID.
I am wondering what you mean by "understand all SIDs." You can, of course, find any user's SID and even convert SIDs to user names. You can also interpret the "well-known" SIDs -- SIDs for common accounts and groups such as Administrator and Administrators.
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