A. If you wish to disable the logoff buttons on the Start menu/NT Security dialog perform the following
- Start the registry editor (regedit.exe)
- Move to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
- From the Edit menu select New - DWORD value
- Enter a name of NoLogoff and press Enter
- Double click the new value and set to 1. Click OK
- Close the registry editor
The change takes immediate effect. To undo simply set to the value to 0.