Pretty sure its pixel level access as well as text. I've never done this, but I've read about it a bit. I think you need to get a hold of the g15 sdk.

here is a link of an example program with source included
http://www.g15forums.com/index.php?o...tartdown&id=32

In general http://www.g15forums.com/forum/ is a good place for that type of info. If you don't have a g15 to test it on, I imagine it being a huge pain to get working.