title: How to detect if user has open more than one window or tab on the same session?
body: <p>I would like to detect if user has open more than one window or tab on the same session and if he did it - I would like to print an special information on screen.</p>
  
  <p>This limte should oblige only in one special URL, so if user has open two tabs/windows with urls: <a href="http://page.com/limite.htm">http://page.com/limite.htm</a> - I would like to print special information. When user has open two windows/tabs with urls: <a href="http://page.com/limite.htm">http://page.com/limite.htm</a> and <a href="http://page.com/index.htm">http://page.com/index.htm</a> - everything is OK and I wouldn't show any informations.</p>
  
  <p>Is it possible?
  Thanks.</p>