Some of the above documents are sets of HTML pages, which have been
derived from a previous ASCII edition. Since ASCII files can only be
read sequentially, these documents still have a corresponding structure.
To ease the navigation, especially sequential reading, within a hypertext
edition, a set of navigation buttons has been placed at the bottom of all
||go directly to the table of contents
||return to a higher chapter or document level
||go back to the previous page of a document
||step forth to the next page of a document
The Back and Next buttons can be used to step back and forth
sequentially. The Up button allows to return to a higher chapter
or document level. The Home button leads directly to the table of
contents of a document.
Last revised: W.W. Heinz,
August 23, 2020