Copyright and Disclaimer.

This tutorial is copyrighted 1998, 1999, by Wayne Bretl and Mark Fimoff.  It may be distributed freely provided that the complete and unmodified tutorial is distributed including this notice, and that no charge is made for it.  It may not be modified, extracted in part, or included in other works without the explicit permission of the authors.

This tutorial is based on various national and international standards and is not guaranteed to be accurate, complete or error free. Since standards may be revised from time to time, this tutorial may not reflect the latest version of the standards, and also may be revised without notice. The user is warned to verify information in this tutorial by reference to the current relevant national and international standards.