gui_get_screen - Returns the bitmap surface GUI routines draw to. Allegro game programming library.

       This  function  returns  the current bitmap surface the GUI routines will use for drawing. Note that this
       function will return screen if you have called gui_set_screen(NULL) previously,  and  will  never  return
       NULL.

       gui_get_screen - Returns the bitmap surface GUI routines draw to. Allegro game programming library.

gui_set_screen(3alleg4)

Allegro                                           version 4.4.3                          gui_get_screen(3alleg4)

#include<allegro.h>BITMAP*gui_get_screen(void);