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    <p>Windows users and groups use security identifiers (SIDs).</p> <blockquote> <p>A security identifier (SID) is a unique value of variable length that is used to identify a security principal or security group in Windows operating systems.</p> </blockquote> <p>There is a <a href="http://support.microsoft.com/kb/243330" rel="nofollow noreferrer">list of predefined SIDs</a> that Windows has built-in. Other SIDs are generated by combining the current computer's (randomly generated, 96-bit) SID with an incremented number.</p> <p>SIDs of users that have accounts on a computer are stored in the registry under <code>HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\ProfileList</code></p> <p>Sample SIDs (taken from <a href="http://support.microsoft.com/default.aspx?scid=kb;EN-US;314828" rel="nofollow noreferrer">The Microsoft policy concerning disk duplication of Windows XP installations</a>):</p> <p>The following example displays the SIDs for four local user accounts. Note that only the last four digits are incremented as new accounts are added. </p> <ul> <li>S-1-5-21-191058668-193157475-1542849698-500 Administrator</li> <li>S-1-5-21-191058668-193157475-1542849698-1000 User 1</li> <li>S-1-5-21-191058668-193157475-1542849698-1001 User 2</li> <li>S-1-5-21-191058668-193157475-1542849698-1002 User 3 </li> </ul> <p>Because of how SIDs are generated, they <em>should</em> be unique. Since they are part of the windows profile system, roaming profiles should have the same SID on every system.</p>
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