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Clik here to view.MO Auto add terms is a PHP module for Drupal 6.x.
It is particularly useful for maintaining small and large taxonomies with a small or large number of nodes. Especially taxonomies used as site indexes or glossaries.
This module automatically handles the addition (and optionally removal) of taxonomy terms to a node. It does it at the time the node is saved and when the background process runs (i.e. CRON.)