Default USB data transfers on the Pocket PC

I need to be able to transfer data across the USB port on this system, but can't find any information on doing this with arbitrary data. The books 'USB Design By Example' and 'USB Complete' seem to be too low level (I'm not designing a new device) and the MSDN docs that come with Embedded Visual C++ 3.0 seem to be too high-level, dealing mainly with application APIs and ActiveSync. All I want is to be able to open the USB connection and talk/reply to whatever's on the other side, in much the same way that serial comms are done. Absolutely any pointers or comments on this would be appreciated. Currently I'm using a Fujitsu-Siemens Pocket LOOX but anything more generic would be fine.