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  1. or download this
        $top->protocol( 'WM_DELETE_WINDOW',
                    \&my_clean_up_routine( $top, $another_parameter);
  2. or download this
       $window->protocol('WM_DELETE_WINDOW',\&your_exit_handler);
  3. or download this
       $window->protocol( 'WM_DELETE_WINDOW', \&Tk::NoOp);