Normally PC side it's driver based. My assumption would be both handset and modem capabilities. It would be a bad play on RIM's part if they did not impliment the modem aspect into their software, as most non-smart phones can be used as a modem via bluetooth with the right sotware/drivers on their PC. I may have to look into that more and get my hands on one here at work to play with when it rolls out here in the states.

-Goth