"Letizia Alvarez de Toledo has observed that this vast library is useless: rigorously speaking, a single volume would be sufficient, a volume of ordinary format, printed in nine or ten point type, containing an infinite number of infinitely thin leaves."

Jorge Luis Borges, The Library of Babel

Professor Henry Lieberman's Letizia is a user interface agent that operates in tandem with a conventional Web browser such as Mosaic or Netscape and assists a user browsing the World Wide Web. As the user operates a Web browser, the agent tracks user behavior and attempts to anticipate items of interest by doing concurrent, autonomous exploration of links from the user's current position.

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