3.18) The help bar.

type gr_helpbar =
  { hl_window : gr_window
  ; mutable hl_help : string
  }
;;
The help bar is a bar at the bottom of the window where the program can display strings that indicate the program's state, or possible commands, or running function, etc...
The help bars, of type gr_helpbar, are composed of: The functions linked with the type gr_helpbar are:
gr_draw_helpbar : gr_helpbar -> unit
gr_draw_helpbar Helpbar draws the help bar Helpbar.