Connect your TomTom-PNA with your Computer and visit this page. If nothing is found immediately while your TomTom is definitely connected to your Computer (e.g. TomTom Home finds it or it is visible from your Desktop), then press search. When you see your device's serial number, then the connection works. :) After that you can either install or remove the project. You need to have Java installed to be able to use this Applet!