how to test for a website accessibility?

Question by mbaki: how to test for a website accessibility?
i need to know how to test the hardware and software of my website for accessibility. what is it required for a website to be accessible?
please help!!!

Best answer:

Answer by David D
http://www.w3.org/WAI/ makes a good starting point for learning about web accessibility.

http://www.sitesifter.co.uk/ is a useful tool to automate massive chunks of it.

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