(c)Hal Berghel, 2001. All rights reserved. All requests for reproduction and/or distribution of this electronic document should be submitted via Email to the author at hlb -at- berghel dot net .

This is a draft version (preprint) of material which was later published in substantially the same form in my Digital Library Pearls column in the ACM Digital Library. The published version is a copyrighted feature of Association for Computing Machinery (ACM). All requests for reproduction and/or distribution of the published version should be directed to the ACM, Publications, 1515 Broadway, New York, NY 10036-5701, 212-869-0481.