it’s an utilty used expeccially for flightsims wich allows you to control many many keyboards trough a touchscreen (or a second normal screen by mouse)
there are probiles with switches and buttons resembling those of a WWII plane.
Here a video
http://www.youtube.com/watch?v=drcHnu3f5iw
here the official forum
http://www.touch-buddy.com/forums/faq/18-master-faq.html
and here the small app that should let use touchbuddy on an ipad
http://itunes.apple.com/app/air-display/id368158927?mt=8
so far i was not able to make it work but i love this idea too much and will try further…