code: public final function getWindowContent ()
  	{
  		$out = $this->getContent ();
  		
  		if (!$out || $this->getType () == 'invisible')
  		{
  			return false;
  		}
  		
  		// Tracker (yes, we need opensocial as well)
  		if (isset ($_SESSION['just_logged_in']) && $_SESSION['just_logged_in'])
  		{
  			$me = Neuron_GameServer::getPlayer ();
  			if ($me)
  			{
  				$out .= '<iframe src="'.htmlentities ($me->getTrackerUrl ('login')).'" width="1" '.
  					'height="1" border="0" class="hidden-iframe"></iframe>';
  			}
  			
  			$_SESSION['just_logged_in'] = false;
  		}
  		
  		return $out;
  	}
docs: /*
  This function makes sure certain trackers are available in the window
  content.