The communication driver is a dynamic-link library (DLL) containing func-tions that support opening, reading from, and writing to communications devices.
Although the communication driver exports several functions, Windows-based applications do not directly call these functions. Instead, the applications call
functions in the USER module, such as the OpenComm function, which in turn call the communications driver.
Unlike other Windows-based drivers, the communications driver does not include the Enable and Disable functions, although it does include the WEP function.