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 The simplest GTK program
    The 16 line GTK program shown below is just about the simplest
 possible program which uses GTK. (Well, technically, you don't have to
 create the window and it would still be a program which uses GTK). The
 program, when compiled and run, will create a single window 200x200
 pixels in size. The program does not exit until its is explicitly
 killed using the shell or a window manager function.
      #include <gtk/gtk.h>
      main (int argc, char *argv[])
        GtkWidget *window;
        gtk_init (&argc, &argv);
        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        gtk_widget_show (window);
        gtk_main ();
        return 0;
    The first point of interest in this program is the standard
 initialization line.
        gtk_init (&argc, &argv);
    Almost every GTK program will contain such a line. GTK will
 initialize itself and GDK and remove any command line arguments it
 recognizes from ARGC and ARGV.
    The next two lines of code create and display a window.
        window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
        gtk_widget_show (window);
    The `GTK_WINDOW_TOPLEVEL' argument specifies that we want the window
 to undergo window manager decoration and placement. One might be lead
 to think that the window, since it has no children, would be 0x0 pixels
 in size. But, this is not the case because a window that has no
 children defaults to 200x200 pixels in size. Mainly because 0x0 windows
 are annoying to manipulate or even see in some cases.
    The last line enters the GTK main processing loop.
        gtk_main ();
    Normally, `gtk_main' is called once and the program should exit when
 it returns.  Initialization and exit.
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