class eZOwtClientController {                     
  /* Access the one and only 
   * controller instance 
   */
  function &getGlobalController() {
    static $controller;

    if (!isSet($controller)) {
      $controller = new eZOwtClientController();
    }
    return $controller;
  }

  /* the 'start' state transition message */
  function start() {
    // perform post installation checks
    $ok = eZOwtPostInstall::check();
    if (!$ok) {
      print "Post install checks failed. Check error.log\n";
      exit;
    }

    // show login dialog
    $this->_loginWindow =& new OWTLogin();
    $this->_loginWindow->show();
        
    /* Run the main loop. */
    $this->setState(
OWT_CONTROLLER_STATUS_LOGIN);
    Gtk::main();
  }

  function loginComplete($firstTime) {
    // notification when the login window 
    // is closed
  }

  ...
}