This Website is an inter-linked structure of web pages.
Another page can be accessed :
* through the headings at the top of each page,
* through the menu on the left of the page.
* through the Back button or Arrow.
* by clicking on underlined text on the current page.
The Ship at the top left of each page will open a page at a higher level,
often taking you back to the top level.
You may return to a previous page using the Back button or web control arrow.
From some pages you can generate comments to the author using webmail.
or you can click on the Logo, top left, to return to the main index page.
From the main index, you can (if you have the password) access the Contents List.
The website consists of the personal, and often temporary, ideas of the author.
It is subject to change as these ideas develop or are discarded.
Such changes sometimes introduce technical errors,
for which my apologies!