How to access Portlet Session in Header.vm

[anyz]

I need to display some information in Header.vm that is set by a portlet.
For example double click on one of the table row displayed in Portlet and it
refreshes the page. When reloaded it needs to show the record number in
Header.vm file.

I have checked that in VM file we can access the attribtues set in http
session or Portal Session but not one set in Portlet Session.  I tried
following code:

  #foreach($item in $renderRequest.getPortletSession().getAttributeNames())
   $item
  #end
But it prints only one attribute in portlet session and that is used by
Jetspeed it self.

Thanks