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 PREFETCHING AND CACHING DOCUMENTS ACCORDING TO PROBABILITY RANKED NEED S LIST
 Inventors: Peter L. Pirolli, San Francisco; James E. Pitkow, Palo Alto, both ol Calil.
 Assignee: Xerox Corporation, Stamford, Conn.
 Appl. No.: 09/083,645  Filed: May 22, 1998
 Int. CI.7 G06F 17/30
 U.S. CI 707/2; 707/5
 Field of Search 707/2, 5, 10
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Primary Examiner—David L. Robertson  ABSTRACT
A method is presented for determining whether to prefetch and cache documents on a computer. In one embodiment, documents are prefetched and cached on a client computer from servers located on the Internet in accordance with their computed need probability. Those document with a higher need probability are prefetched and cached before documents with lower need probabilities. The need probability for a document is computed using both a document context factor and a document history factor. The context factor of the need probability of a document is determined by computing the correlation between words in the document and a context Q of the operating environment. The history factor of the need probability of a document is determined by integrating both the recency of document use and the frequency of document use.
20 Claims, 8 Drawing Sheets