The Duo2 remote control can be setup using the Ultimo files. I would guess the Solo2 would also work with the Ultimo files.
The Slingbox forums tell you how to set up the remote control on a PC.
A quick run through of the process is:
First put the Ultimo files in the sbav folder - then launch the player and:
setup assistant - config video - Standalone DVR - Other - Custom - V2010