This function enlists a window for receiving change notifications.
BOOL WINAPI SHChangeNotifyRegister( HWND hwnd, SHCHANGENOTIFYENTRY * pshcne );
[in] Handle to the window that will receive the WM_FILECHANGEINFO message.
[in] Pointer to a SHCHANGENOTIFYENTRY structure identifying the types of events for which the window should receive change notifications. Set to NULL and the window will receive all file system, network, and media notifications.