Anyone know- for activesync over usb is the device using the "RNDISFN interface" or RS232?

basically I dont use activesync for email so I'd prefer not to call activesync ever. If automatically gets called when an internet connection is made and I'd like to nuke that notification. There's on for the RNSISFN and one for RS232 that calls activesync.

If I can I can nuke the internet one without nuking the USB one i'd be happy.