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John Walkenbach is a leading authority on spreadsheet software, and principal of J-Walk and Associates Inc., an Arizona-based consulting firm that specializes in spreadsheet application development. John is the author of about 40 spreadsheet books, and has written more than 300 articles and reviews for a variety of publications, including PC World , InfoWorld , PC Magazine , Windows , and PC/Computing . He also maintains a popular Internet Web site ( The Spreadsheet Page , ... and is the...See more