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Domain Name Server (DNS)
This is the way that Internet domain names are located and translated into Internet Protocol addresses (such as `www.siebendesign.net`). A domain name is a meaningful and easy-to-remember "handle" for an Internet address (like 209.25.221.22) .
Because maintaining a central list of domain names and the corresponding IP address would be impractical, the lists of domain names and IP addresses are distributed throughout the Internet in a hierarchy of authority. There is probably a DNS server within close geographic proximity to your access provider that maps the domain names in your Internet requests or forwards them to other servers in the Internet.
DOM
The Document Object Model is a description of how an HTML or XML document is represented in a tree structure. DOM provides an object oriented application programming interface that allows parsing HTML or XML into a well defined tree structure and operating on its contents.
DEVELOPER LINKS
Best PHP framework
Yii is by far the best PHP based framework I have yet to see. It appears to have all of the functionality that I have come to know and enjoy from Ruby on Rails applications, but it does not require the same overhead that Rails demands. Right now the jury is still out on this framework, but it looks very promising!
All about Sudo
This article give some great tips about the sudo command: how to use it to properly administer a system and why.