When you click the Microsoft Dynamics NAV application icon to start the program, you will briefly see a window with information about the application. When you click Help, About Microsoft Dynamics NAV on the menu bar, the same window appears - it will remain open until you click OK. The window contains information about copyright, version number, program name, and the owner of the license to the program, as well as other product information. This window also contains a link that helps you check whether or not your license file is a valid Microsoft Dynamics NAV license.