This function sets the device control block.
BOOL HWSetDCB( PVOID pContext, LPDCB pDCB );
TRUE indicates success. FALSE indicates failure. If an error occurs, the caller can return the error using GetLastError.
This function is called by the MDD after the user has called the SetCommState function.
This function supports the implementation of the Serial Port Drivers PDD. This function is defined in the header file SerHW.h, and is available in Windows CE version 1.0 and later.