d_button_proc man page

#include <allegro.h>

int d_button_proc(int msg, DIALOG *d, int c);

A button object (the dp field points to the text string). This object can  be selected by clicking on it with the mouse or by pressing its keyboard  shortcut. If the D_EXIT flag is set, selecting it will close the dialog,  otherwise it will toggle on and off. Like d_text_proc(), ampersands can  be used to display the keyboard shortcut of the button.

excustom(3), exgui(3)

excustom(3), exgui(3).