|  | CopyrightThis tutorial was originally produced by the Global 
    SchoolNet Foundation in 1996.(Revisions made in 1999, 2001, 2003, 2004).  All rights are reserved.
 Authors (Al Rogers, Yvonne Marie Andres)Contributors (Sara Armstrong, Clyde Boyer,
            Wendy Clash,
 Karen Eini, Graham Hellewell, David Warlick,
            Bill West)
 Portions of this tutorial were written with support from BBN's National School Network Testbed,  National Science Foundation Grant
    #RED9454769,  Advanced
    Network & Services, Microsoft and the US Department of Education 
    grant in support of Friendship Through Education. Other materials on this tutorial, including but not limited to,
    proprietary programs and resources such as (but not limited to) Adobe® Acrobat® Reader and other software and resources, such as articles and
    Web pages, belong to the respective copyright holders (as indicated on or near the Web
    pages used or on the original Internet archive) and are used by permission. Please contact
    the respective copyright holder if you wish to use any other Web pages, software, or other
    resources not owned by the Global SchoolNet Foundation. Permission is hereby granted to any public or private teacher, school,
    school district, or other bonafide public or private educational agency to 
    duplicate for non-profit, non-commercial use, providing: 
      You notify GSN of the nature of your use at
      helper@gsn.org You preserve all credit for all contributors 
      If you edit or expand on these pages, you must send GSN a copy of your
        new pages at helper@gsn.org. If we like your changes
        we'll incorporate them into the next edition. Exception: You may NOT mount any portion of 
    this tutorial on an
    Internet- accessible Web server.
 License TermsGrant of License. This TUTORIAL may be freely copied and/or used in any public or private school or nonprofit
    institution by students and teachers. However, regardless of the circumstances, no one may
    sell this TUTORIAL  or its contents or charge any fee for the use of this 
    TUTORIAL  or any of
    its contents. This TUTORIAL  contains several proprietary  resources which have
    been made available by their copyright owners for educational use only. Every user of this
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 Limited Warranty.THE CONTENTS OF THIS TUTORIAL ARE PROVIDED AS IS AND 
    WITHOUT WARRANTY, EXPRESS AND IMPLIED. THUS, FOR EXAMPLE, THERE IS NO 
    IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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    THIS TUTORIAL BE LIABLE FOR ANY DAMAGES, INCLUDING LOST PROFITS, LOST SAVINGS, OR OTHER
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