FTDI's 1st, 2nd and 3rd generation of USB UART and USB FIFO chips can be installed with one of two sets of drivers under Windows CE.
The first driver type is the D2XX direct driver. This provides direct access to the device via a dynamic link library (DLL) supplied with the driver. Applications can then be written which use the functions available in the DLL to directly control the device.
The second driver type is the virtual COM port (VCP) driver. The VCP drivers emulate a standard COM port. These can be communicated with in the same manner as any other COM port on the PC.