To check if it really works, goto the halo arena or RS3 arena. There are almost always people in there.
To start games off the HD, first select the arena, hit the black back button on the joypad, goto programs, and load the game matching the arena you chose.
be sure you have configured your kai tag and password into the xbmc config file. Also on the PC side, you open Kai but dont log on.
Hope thats helps someone here.
Best to have a bios with IGR, that way when you want to go back to Kai, you reset using IGR and load back xbmc and change your arena. No more running to the PC.