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Also known as: Supersedes
A header naming an earlier article, by Message-ID, that the new one replaces. Servers honoring it delete the old article as the replacement arrives, which is as close as Usenet comes to editing a post. Its main legitimate use is periodic FAQ postings, where each fresh copy supersedes last month's. Like cancels it can be forged, so a good many servers ignore the header entirely.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.