Event triggering in server-side scripts

Posted by Qiao on Stack Overflow See other posts from Stack Overflow or by Qiao
Published on 2010-03-23T10:48:30Z Indexed on 2010/03/23 10:53 UTC
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database

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php

In SO, when your question got answer. or you got new badge, event is triggered. Or when you got new PM in forum, it also lets you know by alerting message.

You see message that something happened with your account when you enter site for first time after this event.

How is this implemented? How do scripts know, that they have something new to show you?

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