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Wiki Wiki Web
This site is the home of the first ever Wiki site, created for the Portland Pattern Repository in 1995. The site now hosts tens of thousands of pages. This particular page give an introduction to Wikis for visitors.
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Use Mod Wiki: What Is a Wiki?
An explanation in question-and-answer form about wikis. Explains basic concepts, derivation of the name, and how to get started with this type of internet communication.