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Wikis are a great web-based tool for storage and retrieval of all types of information. As you put information into your private wiki, it becomes searchable (like Google Search) and linkable. It’s simple to create system documentation, articles, links, web bookmarks and much more. Do “brain dumps” and create a simple place to store everything. Instructional documents and common extensions are installed with your system. Once your needs are defined, basic installation and set up on the web can often be accomplished in less than a day.
Wikis are the simplest form of Web site for creating content. If you have information to store and you don't know where to put it, put it on a wiki.
MediaWiki is the opensource wiki software that runs [http://en.wikipedia.org Wikipedia] and many other wikis.