offer_focus - Offers the input focus to a particular object. Allegro game
int offer_focus(DIALOG *dialog, int obj, int *focus_obj, int
Offers the input focus to a particular object. Normally the function sends the
MSG_WANTFOCUS message to query whether the object is willing to accept the
focus. However, passing any non-zero value as force argument instructs the
function to authoritatively set the focus to the object.