On November 3 2009, Sysinternals retired NewSID , a utility that changes a computers machine Security Identifier (machine SID). I wrote NewSID in 1997 (its original name was NTSID) because the only tool available at the time for changing machine SIDs
-
http://blogs.technet.com/markrussinovich/archive/2009/11/03/3291024.aspx