install_keyboard_hooks - Man Page

#include <allegro.h>

void install_keyboard_hooks(int (*keypressed)(), int (*readkey)());

You should only use this function if you *aren't* using the rest of the  keyboard handler. It should be called in the place of install_keyboard(),  and lets you provide callback routines to detect and read keypresses,  which will be used by the main keypressed() and readkey() functions. This  can be useful if you want to use Allegro's GUI code with a custom  keyboard handler, as it provides a way for the GUI to get keyboard input  from your own code, bypassing the normal Allegro input system.

install_keyboard(3), keypressed(3), readkey(3)