title: window.opener becomes null in Internet Explorer after security zone change
body: <p>My application runs in Local Intranet zone which launches a popup. This popup opens another page in my application (Local Intranet zone) which redirects to an authentication page (Internet zone) which after successful authentication sends back to my application page ( Local Intranet zone). However, at the final page, window.opener becomes null and I can't call methods on parent page. </p>
  
  <p>This doesn't happen when all pages load from the same zone. Is there a way around this behavior so that I can call methods on parent page after redirect?</p>