Every form has an associated pair of curses windows. The form window displays any title and border associated with the window; the form sub-window displays the items of the form that are currently available for selection.
The first four functions get and set those windows. It is not
necessary to set either window; by default, the driver code uses
stdscr for both.
The function scale-form returns the a list of two elements: minimum size required for the subwindow of form.