This document is Copyrighted 1996 by Albert Benschop. You may make personal copies of this document, as long as you do not put it on your own web server or sell it in print, without our permission. You may add links to this document wherever you wish. If you do add a link to any part of this site I would appreciate it if you would let us know. You'll only have to pay when you start exploitating our work for your profit.