The following off-site links may be of interest (in some cases I may be building good will by exchanging links with the other site). I am not responsible for the contents of these sites.
Copyright (c) Gerry Ashton 2008-9. Permission is granted to copy, distribute and/or modify this web page and its subpages under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the subpage entitled "GNU Free Documentation License".