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How the ilusion of causing site to change content from server side is done? Let the example be gmail chat or chat on facebook. Or even new message sign on stack overflow.
Is it done by http://en.wikipedia.org/wiki/Comet_(programming)) ?
Thanks for help
That sort of things is usually done with a block of JavaScript firing again and again according to a timer. It will check the state of the things in the database and adjust something in the markup. For instance, change the CSS class of some element to introduce a different color or a bold font, replace a picture with the one done in a brighter color etc. Quite simple really. No magic involved.