An example dispatch.php script.

<?php

/* Global security measures */

switch ($_GET['task'])
{
    case 'print_form':
        include '/inc/presentation/form.inc';
        break;
    case 'process_form':
        $form_valid = false;
        include '/inc/logic/process.inc';
        if ($form_valid)
        {
            include
            '/inc/presentation/end.inc';
        }
        else
        {
            include
            '/inc/presentation/form.inc';
        }
        break;
    default:
        include
        '/inc/presentation/index.inc';
        break;
}
?>