title: How to implement Comet ?
body: <p>I have been developing web applications for some time but have very recently been introduced with the Comet server side push technology and my understanding of this technology is very immature. While the link <a href="http://www.zeitoun.net/articles/comet_and_php/start" rel="nofollow">http://www.zeitoun.net/articles/comet_and_php/start</a> provides two simplistic example implementations using an infinite loop in PHP, I would like to know more on the repurcussions of the above methods and if it is suitable for production. 
  What advantages do dedicated comet servers like Meteor(http://meteorserver.org/) , streamhub (http://www.stream-hub.com/), freeliberator (http://www.freeliberator.com/index.php) ? </p>
  
  <p>Also how different is Comet server side push from HTML5 web socket facility ? </p>
  
  <p>My principle objective is to build a variant of collaborative real time document editing facility. </p>