install_mouse - Installs the Allegro mouse handler.

       Installs the Allegro mouse handler. You must do this before using any other mouse functions.

       install_mouse - Installs the Allegro mouse handler.

       Returns  -1  on failure, zero if the mouse handler is already installed (in which case this function does
       nothing) and the number of buttons on the mouse if the mouse handler has successfully been installed (ie.
       this is the first time a handler is installed or you have removed the previous one).

       Note that the number of mouse buttons returned by this function is more an  indication  than  a  physical
       reality.  With  most  devices  there  is  no  way of telling how many buttons there are, and any user can
       override the number of mouse buttons returned by this function with a custom configuration file  and  the
       variable num_buttons. Even if this value is overridden by the user, the global mouse variables will still
       report whatever the hardware is sending.

remove_mouse(3alleg4),         poll_mouse(3alleg4),         mouse_x(3alleg4),        show_mouse(3alleg4),
       get_mouse_mickeys(3alleg4), position_mouse(3alleg4), set_mouse_range(3alleg4), set_mouse_speed(3alleg4)

Allegro                                           version 4.4.3                           install_mouse(3alleg4)

#include<allegro.h>intinstall_mouse();