The default About output unit has an explanation of the buttons used in
the document, controlled by SECTION_BUTTONS.
The formatting of this is influenced by
the text, description and example
direction strings (see Direction Strings) and by ACTIVE_ICONS
(see Simple Navigation Panel Customization).
PROGRAM_NAME_IN_ABOUT can also be used to change the beginning of
the About output unit formatting.
If the above is not enough and you want to control exactly the
formatting of the about unit, the about special output unit body
reference function may be overridden
(see Special Unit Body Formatting Functions).