Just a pointer, if that helps..

At this moment there are 2 rdesktop compiled for the ITs. The one you will find in the app manager and the http://www.wardenclyffetower.com/Mae...desktop-15.deb

The first one has gui the second one though might serve your needs better.
Check the options you need to set but you will need also to find a way to start the wlan connection beforehand.

Good luck,
Chris