PC-Hypertext: Attributes 2.

-  Links connect associated nodes (ideas) in PC-Hypertext.  These
links remain in place regardless of how many times the ideas are
modified, moved, or changed.  The development programs (HOUDINI,
MaxThink) enable application authors to quickly construct or
modify nodal links, and to merge or split nodes (idea topics)
without invalidating the links that connect them.  Utility
routines can create associative links between topics according to
the key words, text strings, or parallel existing links that are
specified by the system developer.  HOUDINI and MaxThink routines
also permit system developers to test the integrity of the
network links constructed in the system.

- While the modification or creation of associative links in
PC-Hypertext is relatively simple, it is important to remember
that effective hypertext construction depends on a highly
structured information network that is based on the
classification and associative linking of idea nodes that might
span a broad range of information fields and subjects.

- The Main menu is always displayed as a hierarchical
organization, yet it actually represents a network structure in
its support of super-sets, loops, and dual path browsing.  While
PC-Hypertext displays only a hierarchical view of the information
base, it retains the network path established by the current user
in memory.  The user can mark and save the current network path
(using the [F5] key), or simply retrace (reverse) the current
path by pressing the [Left arrow] key. 

<dfile81>   PC-Hypertext: Attributes 1.