title: PortletURL to open another portlet in pop-up
body: <p>I have a hook for <code>create_account.jsp</code>.
  In this jsp I have a javascript code where I try to open a portlet in an iframe pop-up or some pop-up from Liferay.</p>
  
  <p>The question is:<br>
  How to give the portlet URL?<br>
  How can I access it?<br>
  In that portlet I only want to ask a question with YES or NO, and based on the user answer, redirect to some other page.</p>