package for geexbox?

i’d like to use geexbox for interactive multimedia presentations. i thought it would be nice to trigger lets say 3 videos via 3 buttons attached to the arduino board.
i’m still seaching for ways to controll and connect geexbox with the arduino board…
can i connect it via rs232 or does it have to be usb?

is there any kind of package i can get into geexbox for arduino?

otherwise:
can i get it to work if i generate an iso with the “homemade receiver”?

should i then program the arduino to spit out lirc codes?