Can folks please explain the difference between CLSID, GUID and SID? Isn't the CLSID also called the class ID? Still what is the difference between it and GUID? Does IDBlaster affect the SID? Again, correct me if I am wrong but the SID is a unique number for objects in the domain (2000/2003 Server) and changing these numbers I'd guess would prevent object/user identification and mess up object access. Thank you.