DLN_NOTIFICATION_TYPE_WINDOW_MESSAGE (0x03)

The library sends a window message to notify the application. Specify valid window handle in window message member of the DLN_NOTIFICATION structure. Specify message ID (chosen during the initialization) in window message member of the DLN_NOTIFICATION structure. If a notification has been generated by a device, the device handle is returned in the window message. If a notification is sent by the library, the window message returns HDLN_DLL_NOTIFICATION constant instead of the device handle.