There is another HTML5 technology to push stream from server to client : 
EventSource aka Sent-Server Events (http://dev.w3.org/html5/eventsource/). 
Its behaviour is like ajax long polling.
I'm - just now - experimenting a simple mechanism to send to clients a 
message when the database changes.
Pros : The implementation is enough simple.
Cons : IE9 doesn't support EventSource.



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