In the cheezy but effective category, if you are trying to create the visual impression of a continuously updated document but don't want the web server to have a bunch of processes loitering for extended periods of time sucking up system resources, you can use a meta tag like
<meta HTTP-EQUIV="REFRESH" CONTENT="15;URL=http://www.myurl.com/myapp?tail=mytail">
If the URL is self-referencing, then the page continuously updates itself every 15 seconds.
This strategy is used by the
Big Brother monitoring tool, for example.
Hope this helps!
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