To display a shutdown button at Login, edit:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
Value: ShutdownWithoutLogon REG_SZ 0 or 1
When this value is set to 1, you can select Shutdown ...
Edit: HKEY_USERS\.DEFAULT\Control Panel\Desktop
Double click ScreenSaveActive and set it to 1.
Double click SCRNSAVE.EXE and enter the full path to the screen
saver you want to use such as SCRNSAV...