zAppFrame *appWindow = new zAppFrame(0, new zSizer,zSTDFRAME,
                              "A zApp App")

           This line dynamically allocates mamory and creates  
       the application's main window  object,calld the
       frame window, which belongs to th class zFrameWin.
       But this is only the frame. We cannot input and output
       in this class.

 zText Pane *hellowPane = new zTextPane(main Window, new zSizeWithParent);

          This line dynamically allocates a zTextPane as a child
      of the zAppFrame window. The zTextPane allows to input,
      to output, to show text using C function such as printf( ).