title: what comet technique is this demo using?
body: <p>what they do on this demo is exactly what i wanna do.</p>
  
  <p><a href="http://www.lightstreamer.com/demo/RoundTripDemo/" rel="nofollow noreferrer">http://www.lightstreamer.com/demo/RoundTripDemo/</a></p>
  
  <p>i wonder what comet technique they are using.</p>
  
  <p>it cant be iframe cause on Firefox i can open two tabs with same link. with iframe u cant do that. and it cant be long polling with ajax cause i didnt see it polled anything with firebug.</p>
  
  <p>someone knows the answer? (would be great with some link to good tutorials that do exactly the same thing with same technique).</p>