FRAME_X_DISPLAY    99 src/msdos.h    #define FRAME_X_DISPLAY(ignored) NULL
FRAME_X_DISPLAY   468 src/pgtkterm.h #define FRAME_X_DISPLAY(f)        (FRAME_DISPLAY_INFO (f)->gdpy)
FRAME_X_DISPLAY  1368 src/xterm.h    #define FRAME_X_DISPLAY(f) (FRAME_DISPLAY_INFO (f)->display)