A. If you want to disable an NT servers ability to handle authentication then it is possible to stop the "Net logon" service:

  1. Start Control Panel
  2. Double click on Services
  3. Click "Net Logon" and then click Pause
  4. Exit Control Panel

To disable all of NT's server services, click on Server and click stop, which will stop "Net Logon", "Computer Browser" and any other server services.