Link Information

A link which is colored,
either visited or not,
is to information that is prerequisite
to the page on which the link is found.

A link which is the same color as the surrounding text
is to information which is either concurrent or subsequent
to the page on which the link is found.

However,
the non-prerequisite links have a colon at the end,
so you can see whether or not you have visited their information.