Joycon and Nexus 7

This shows that the Joycon EXR can control the Nexus 7 with volume up/down, track forward/reverse as well as mute.  

CarPC JoyCon EX – App Launcher

How to use Steering Wheel Remote Controls on CarPC with CarPC JoyCon EX. This shows Application Link. Application Link enables steering wheel remote controls to launch or pupop an application with preset changing.

Using Steering wheel remote controls in Centrafuse

CarPC JoyCon EX enables you to control Centrafuse with your steering wheel remote controller CarPC JoyCon EX is a USB interface that convert steering wheel remote controls into Keyboard and Multimedia keys. CarPC JoyCon EX is on ebay.com