http://en.wikipedia.org/wiki/Flying-Model-Simulator You will need a transmitter or a buddy box to operate this system. I think Horzon has one that comes with a dx5, that would let you buy a Champ BNF and offset the cost of the software.
http://www.horizonhobby.com/Products...dID=RTM30R5510 and Wow, the Champ is $90 with a tx. That is a great deal.
A video, [youtube]http://www.youtube.com/watch?v=QqvFXPrlCV8[/youtube]
Tim