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(Common Gateway Interface), is generally the most way for web servers to interact dynamically with users. Common uses include online feedback and online forms.
This takes the form of a computer program that allows web servers to forward requests for processing to other programs, which then return their results to the web server.
Depending on the context in which the acronym is used, CGI can also stand for Computer Generated Graphics.
This site has a ton of great references for DOM (Document Object Model) technologies. It has descriptions and eamples of Document Object Reference, Elements Object Reference, Event Object reference and Style Reference (those are just the subject sheadings!)
Find your router IP in Unix
This can be difficult if your city has a wireless network and provides you with a router (that you don't set up). Luckily there are some useful shell commands available on unix and Vivek Gite wrote about them!
Checking 301 Redirects
This is a search engine optimization tool for checking if your 301 redirect is working properly (or of your site is possibly being indexed as two sites).