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Server side uses your server to parse the info, then serve the completed info on a page. The languages they are written vary from PHP, to ASP, to cgi... the two most popular are probably CARP or MagPie, both in PHP.
The second option is to use client side, this is generally done with javascript, and is a simple snippet of code pasted on your page. There are various options found in this forum. The downside is that the spiders will not be able to see this content, so only your users would benefit from having news to read.