 the value that must be returned
 from the <a href="../../../jakarta/faces/lifecycle/ClientWindow.html#getId--"><code>getId()</code></a> method. If <a href="../../../jakarta/faces/lifecycle/ClientWindow.html#CLIENT_WINDOW_MODE_PARAM_NAME"><code>CLIENT_WINDOW_MODE_PARAM_NAME</code></a> is "none" this method must not be invoked.
 If <a href="../../../jakarta/faces/lifecycle/ClientWindow.html#CLIENT_WINDOW_MODE_PARAM_NAME"><code>CLIENT_WINDOW_MODE_PARAM_NAME</code></a> is "url" the implementation must first lo