How can I check if UPnP feature is working properly? (Windows Vista)

Check if  UPnP feature is working with the following procedure.

1. Click [Start] - [Control Panel] - [View Network status and tasks].
   
   
2. Click [View Full map].
3. Right-click [Gateway], then select [Properties].
   
   
   
   If the menu doesn't appear when you right-click [Gateway], "Network Discovery (UPnP)" on Windows Vista might be disabled, it might be blocked by Windows Firewall, or your router's UPnP might be disabled.