-extern int window_height (Lisp_Object);
-extern int window_width (Lisp_Object);
-EXFUN (Fwindow_full_width_p, 1);
-extern void set_window_height (Lisp_Object, int, int);
-extern void set_window_width (Lisp_Object, int, int);
-extern void change_window_heights (Lisp_Object, int);
-extern void delete_all_subwindows (struct window *);