This security setting determines whether a different account name is associated with the security identifier (SID) for the account "Guest." Renaming the well-known Guest account makes it slightly more difficult for unauthorized persons to guess this user name and password combination.
Policy path:
Computer Configuration\Windows Settings\Local Policies\Security Options
Default:
Guest
Supported on:
At least Windows XP SP2, Windows Server 2003
Registry settings:
Not a registry key
Reboot required:
No