The GET_DIDEVICE_TYPE macro extracts the device primary type code from a device type description code.
GET_DIDEVICE_TYPE(dwDevType)  LOBYTE(dwDevType)
   Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in dinput.h.