ISBN 10: 0-937175-23-4 / ISBN 13: 9780937175231  O'Reilly & Associates January 1989 The following are made available for your personal, non-commercial use only. You may cite this document as a bibliographic reference in any works that you are writing. Any commercial use of this document, including printing and distribution to groups of people (such as a classroom) is prohibited without my prior written permission. - Matteo Marchelli