How to access the hidden screen on an Audi A8?

I just purchased a new Audi A8 and I've heard there's a hidden screen that can be accessed with certain key combinations. Can someone guide me on how to access this screen and what kind of information can be found on it?

In order to access the hidden screen on your Audi A8, press and hold the Menu button for 3 seconds while the car is turned off. Once the screen turns on, use the arrow keys to navigate through the different menus. From here, you can view various diagnostic information, as well as adjust certain settings such as audio and lighting.