On the next few pages are some in depth answers to some common questions- I have found myself explaining these many times over the last 12 or so years. I wanted to include these pages as a reminder for anyone who asked the question, and got the answer, or for anyone else who may just be interested.
Many of the explanations are long and wordy, apologies for that, but there are numerous thick books written on every subject, and it is difficult to shorten a book to one or two web pages- this means that much information has been missed out, but I think (and hope) it covers the important points. I hope they are of use to those interested
If anyone has any comments or suggestions, please do not hesitate to contact me.