Sooo, I've got my basic C HelloWorld program calling the graphics routines and showing a black screen (because I've not drawn anything on it) then it waits 5 seconds and ends. I think the trick though is going to be saving the state the screen was in, so I can restore it once I'm done (go back to the main screen / menus / whatever):
(^^^- Look ma! No bluetooth chip!)
I had to press the touch-menu-buttons to get this to show, it was left on a black screen until the real FDIM software wanted to change the display. (Yes, the screen is upside down.)