Yes, there is two applications that use COMET. One is specifically designed to demonstrate COMET, the other uses it for one relatively small feature. I'd say the former is pretty in-depth, and later is still pretty useful, although definitely not as intensive.
The one specifically for COMET by the way is a game, and it shows how to do something that I've never seen demonstrated anywhere: how to spawn a background
thread and let it update the client. This is something that's clearly not only good for games
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