install_keyboard - Installs the Allegro keyboard interrupt handler.

       Installs  the  Allegro  keyboard  interrupt  handler. You must call this before using any of the keyboard
       input routines. Once you have set up the Allegro handler, you can no longer use operating system calls or
       C library functions to access the keyboard.

       Note that on some platforms the keyboard won't work unless you have set a graphics  mode,  even  if  this
       function  returns  a  success  value  before  calling  set_gfx_mode. This can happen in environments with
       graphic windowed modes, since Allegro usually reads the keyboard  through  the  graphical  window  (which
       appears after the set_gfx_mode call). Example:

          allegro_init();
          install_timer();
          install_keyboard();
          /* We are not 100% sure we can read the keyboard yet! */
          if (set_gfx_mode(GFX_AUTODETECT, 640, 480, 0, 0) != 0)
             abort_on_error("Couldn't set graphic mode!");

          /* Now we are guaranteed to be able to read the keyboard. */
          readkey();

       install_keyboard - Installs the Allegro keyboard interrupt handler.

       Returns  zero  on  success,  or  a negative number on failure (but you may decide not to check the return
       value as this function is very unlikely to fail).

remove_keyboard(3alleg4), poll_keyboard(3alleg4),  key(3alleg4),  keypressed(3alleg4),  readkey(3alleg4),
       ureadkey(3alleg4),                keyboard_callback(3alleg4),                keyboard_ucallback(3alleg4),
       keyboard_lowlevel_callback(3alleg4),          three_finger_flag(3alleg4),          key_led_flag(3alleg4),
       set_leds(3alleg4), set_keyboard_rate(3alleg4), set_gfx_mode(3alleg4)

Allegro                                           version 4.4.3                        install_keyboard(3alleg4)

#include<allegro.h>intinstall_keyboard();