If you are familiar with the XM interface for the XM Direct, it is probably the exact same software front end - I have it, and I love it.. Very easy to use, and it does everything you've heard it does.. The SIRI version uses a Kenwood KTC-SR903 Sirius hideaway tuner, which normally attaches to a Kenwood head unit. Looking at the picture, there is a "To Controller" port, which is the same DIN-8 connection that the XM Direct uses. Assuming this is a regular RS232 serial connection like the XM Direct, all they have to do is change the XM adapter pin configuration to match it.