High Scalability Building bigger, faster, more reliable websites.

Comet has popularized asynchronous non-blocking HTTP programming, making it practically indistinguishable from reverse Ajax, also known as server push. This JavaWorld article takes a wider view of asynchronous HTTP, explaining its role in developing high-performance HTTP proxies and non-blocking HTTP clients, as well as the long-lived HTTP connections associated with Comet.

I had a false belief
I thought I came here to stay
We're all just visiting
All just breaking like waves
The oceans made me, but who came up with me?
Push me, pull me, push me, or pull me out .

So true Perl Jam (Push me Pull me lyrics), so true. I too have wondered how web clients should be notified of model changes. Should servers push events to clients or should clients pull events from servers? A topic worthy of its own song if ever there was one.