Jan -2003
A general updating and tidy up thanks to all the comments and help from many who sent in emails.

From Gary A. Porter of Vicom Systems, Incorporated 47281 Bayside Parkway Fremont, CA 94538 phone (510)743-1164 email gary.porter@vicom.com
A whole load of typos and helpfull suggestions. BTW yes, I am dyslexic :-)

 25-July-2002

Incorporated comments from Jonathan Kirwan (jkirwan@easystreet.com ) on the use of libraries, the math's in particular and corrected typos that he spotted. Other items tided up and some minor expansions.