I have a custom-built USB CDC device. If I plug it into a Windows box (2k, XP, Vista), up pops the Found New Hardware Wizard and I can point it at my .inf file, which supplies a mapping from the USB VID and PID to the USB driver (in this case the inbuilt usbser.sys). Then it appears as a virtual COM port and I can set up dial-up networking, hyperterminal, etc.
I have no experience with Macs at all but I want to do something similar on OS X. Is there an inbulit driver like usbser.sys or do I have to supply my own? Either way, is there some sort of equivalent to the Windows .inf file that I need to create to tell the system to use that driver when it sees my device?
I have access to Apples's I/O Dev Kit but I am not finding the documentation very helpful for a complete newcomer to Macs. Even just some pointers to the right Mac terminology to search for would be helpful.