Places the most recently edited version of the specified window
    on the terminal screen.

    Format

      #include  <curses.h>

      int touchwin  (WINDOW *win);

1 - Argument

 win

    A pointer to the window.

2 - Description

    The touchwin function is normally used only to refresh
    overlapping windows.

3 - Return Values

    OK                 Indicates success.
    ERR                Indicates an error.