Comet is a particular technique to interact asyncronously with the client. Instead of perform a lot of calls using Ajax (polling) the server is able to send to client, whenever it wants, a generic response. Unfortunately in the PHP world there's no simple way to implement this kind of technique and I'll write more posts to explain better how to implement this library and what is generally possible to do, or not possible yet, with Comet idea inside a dedicated PHP environment. At the moment, the only thing you can do is read documentation inside JavaScript and PHP files (truly few lines) and test the first basic example, a server side clock in less than 30 lines of mixed code. As last information, Phomet comes with all necessary to be optimized on client, and its final result is about 1.57Kb on client, and ridiculously 4.52 Kb on server, comments included :) Here is the download , unpack them into your localhost, and go into phomet folder to view the first demo. Compatibility? I...