The radio connection for the robot radios which are included in the kit is a RS-422 connection, which is NOT compatible with the RS-232 connection that your computer, and thus the Programming port on the RC, use. IFI does however, as others have mentioned, have available a RS-232 radio which is specifically designed for use as a remote programming radio or debugger.
For some reason, I can't find the info page itself on their site any more, but here's a link to the manual for the "Stamper" radios...if you give them a call, they might be able to help you out with how/where to get them...
http://www.innovationfirst.com/first...er_userman.pdf