* Play video
* Run an emulator
and have accessibility to any game that you have a backup copy of. This can range from Atari 2600 and Sega Master System to Nintendo 64 and Playstation. The emulator you can run is only limited by the systems resources. Alternately include an actual gaming system in the car.
* Connect a controller from the system of your choice to your CarPC. Microsoft Xbox controllers are very simple to modify yourself and drivers are readily available. If you prefer a controller from another system there are companies that sell them with USB connectivity pre-wired.
* Install multiple monitors and controllers for mobile multiplayer gaming.