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Definition: virtual hypertext

A hypertext link that is created by software on the fly by matching a word or phrase to an existing list. It eliminates the need to predefine links in the text and avoids the underlined words that break the smooth flow of reading a sentence. Virtual hypertext is not common, but it embodies the true meaning of hypertext as coined by Ted Nelson (see hypertext).

This Encyclopedia
The Windows version of this encyclopedia supports virtual hypertext. Users can click on a technical single-word or multi-word term anywhere within the body of a definition and jump to that term's definition without predefined links.

AnswerTips from Answers.com
The popular reference site Answers.com lets any website support virtual hypertext. By adding a small amount of code to the site's pages, AnswerTips lets a visitor highlight any word and look up its definition on the Answers.com website. See smart tags and overlinking.