FARWINDOWPROC

The FARWINDOWPROC type describes a callback function for the dialog window.

typedef LONG_PTR (WINAPI *FARWINDOWPROC)(
  HANDLE   hDlg,
  int      Msg,
  int      Param1,
  LONG_PTR Param2
);

For detailed description of function parameters see: "Dialog API Messages" and "Dialog API Events".