Navigation Aids
Several navigational aids have been developed to help users in
finding the information they are looking for without getting lost
in the hyperdocument.
Typical navigation aids are:
Most hypertext systems offer at least a few of these facilities.
Knowing which navigation aids are available may help authors in deciding
which links to provide. Providing many links to the same nodes is less
troublesome if the "highlighting links" facility is available.
Likewise, having nodes with no outgoing links is not much of a problem
if "backtracking" is offered.