It makes sense for a hypertext delivery system to function differently during several temporal stages. Algorithms in the solution would change according to the choices made by the readers.
Such a system should be particularly sensitive to the course of reading, which it could recognize by observing the frequency of recurrences and the proportion of unvisited material remaining. As Robert Kendall puts it, a reader could also be allowed to shift the system manually into End Reading Mode. During this stage the system could, for example, increase the reader's access to diverse areas of the hypertext--and therefore new material--by activating conditional links in each node.
In the metabolean hypertext, different link frames indicate not just visited or unvisited nodes--following links of a particular frame take one through one or more visited nodes to reach unvisited material.
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