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Emacs is a powerful editing system which may be freely copied-it is freeware. One of the interesting components of Emacs is its on-line help system, called Emacs-INFO. The Text for INFO is stored in nodes which also contain links to other nodes.
In Emacs-Info a link to text that is an expansion of a particular topic may be presented on a menu which consists of a list of node names. When amenu item is selected , the INFO program searches for the required node and displays it. At the top of the node, call it node X, are labels that begin with either Prev: Next: or Up:. Following the colon is the title of another node. 'Prev:' points to a node meant to be previous following X. Conversely , 'Next:' points to the node sequentially following X. 'Up:' label is followed by the name of the node that contains the menu entry for X. An option exists to jump to nay node in the system by giveng its node name. additionally, the user may request via a 'previous-in-time' command to see the node last visited. If the user had been at node Y before going to node X, then activating thje 'previous-in-time' option returns the user to node Y.
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