title: Build real time notification using comet in php
body: <p>I want to build real time notification system just like facebook and google+. I know they are using comet and ajax push technology for that.I have found the tutorial <a href="http://www.zeitoun.net/articles/comet_and_php/start" rel="nofollow">http://www.zeitoun.net/articles/comet_and_php/start</a> from this link i just want to know that how can i implement Comet with iframe technique(you can found this on above link) using mysql database and how i can i identify the user to whom i push the data.</p>
  
  <p>Thank You.</p>