As you rightfully pointed out, HTTP requires data to be 'pulled' by the client. Gmail can still 'pull' data from the server by using a timer to trigger the HTTP operation instead of requiring the user to click something. So, it may seem to be auto, but it is still…
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Looks like auto but still client initiated.( Comet)
Still better than polling ( getting jQuery to do the Ajax, yuck tools of the unemployed)
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