A redirect is a special page that automatically causes the text of another page to be displayed in its place. A redirect that points to another redirect is called a double redirect. These pages are undesirable, because Wikipedia's MediaWiki software will not follow the second redirect, in order to prevent infinite loops. A self-redirect is an article that redirects to itself. These situations create slow, unpleasant experiences for the reader, waste server resources, and make the navigational structure of the site confusing.

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Sometimes, it might be useful to look up a subject in the same way you would do so in a book—in the index. Wikipedia has an index. To use it..

1. click on the Special pages line of the Tools menu
2. from the Lists of pages section, click on the All pages with prefix link
3. at Display pages with prefix: type the beginning of the article's name into the box and press Go.

You will see a list of all pages that begin with what you typed.

You can reduce the number of articles displayed in this list by typing more of the name and pressing Go again. You can also find Wikipedia users in a similar way by changing the entry in the drop-down box labelled Namespace, from (Article) to User.