title: How does isNew() tell if the session is a new one or is already in use?
body: <p>How does calling <a href="http://docs.oracle.com/javaee/1.2.1/api/javax/servlet/http/HttpSession.html#isNew%28%29" rel="noreferrer"><code>isNew()</code></a> on the session object,check if the session is a new one or is already in use ?</p>
  
  <p>I read that <code>isNew()</code> returns true if the client has not yet responded with the session ID. But what does it mean ? Please explain</p>