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Why button bars are useful
For the information designer hypertext links are a mixed blessing. The radical shifts in context that links create can easily confuse Web users, who need organized cues and interface elements if they are to follow and understand hypertext links from one Web page to another. This is particularly true when you want users to be able to follow (or at least recognize) an ordered sequence of documents. Notice in the diagram above that although the user has entered the second Web site at page 6, the site is an ordered sequence of pages.
By augmenting the standard Web viewer "Back" and "Forward" buttons with "Next Page" and "Previous Page" buttons built into the page itself the user then has interface tools to navigate through the information in your site in the sequence you intended. Button bars can also display location information, much the way running chapter headers do in printed books:

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