Forms of Hypertext

Best known form is that of nodes of information linked together by specific links. This set of nodes and their links form a "web". It is the most general form. There are other forms of links:
Indexes
an index is kept (or built) for a large set of similar material (eg. documentation in FIND on VM). Links are followed from the index into the material by giving keyword(s).
Dynamic links
Links are built "on the fly" by interpreting the structure of the material. Eg. the presentation of mail and news messages, where the list of messages is used as a list of anchors.
Knowbots
a query is stated, and some active process tries to find the answer by examining the contents of nodes. This is a generalisation of databases. Searches can take a very long time.
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RC