set_window_title (3) - Linux Manuals
set_window_title: Sets the window title of the Allegro program.
NAME
set_window_title - Sets the window title of the Allegro program.SYNOPSIS
#include <allegro.h>
void set_window_title(const char *name);
DESCRIPTION
On platforms that are capable of it, this routine alters the window title for your Allegro program. Note that Allegro cannot set the window title when running in a DOS box under Windows. Example:
set_window_title("Allegro rules!");