I can see that keycodes are generated for F1 and F2, but no code is generated for F3. Nevertheless pressing F3 activates the screen-display from sleep-mode, i.e. the key-press is registered. My guess is, that F3 is captured by another application and not forwarded to my browser-application (the top-level application). Can somebody tell how to ensure forwarding to to top-level-application for F3?