WPINC_class wp.php Notes - WordPress-Thinstall/wordpress-develop GitHub Wiki

interface AppEnvironment {
    public function add_query_var($qv);
    public function remove_query_var( $name );
    public function set_query_var($key, $value);
    public function parse_request($extra_query_vars = '');
    public function send_headers();
    public function build_query_string();
    public function register_globals();
    public function init();
    public function query_posts();
    public function handle_404();
    public function main($query_args = '');
}

Note Looks like a kernel for HTTP handling.