turn <code>true</code> if this
 <code>ResponseStateManager</code> instance wrote out state on a
 previous request to which this request is a postback,
 <code>false</code> otherwise.</p>

 <p>The implementation of this method for the Standard HTML
 RenderKit must consult the <a href="../../../../javax/faces/context/ExternalContext.html" title="class in javax.faces.context"><code>ExternalContext</code></a>'s
 <code>requestParameterMap</code> and return <code>true</code> if
 and only if there is a key equal to