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The command a client sends to ask what a server supports before doing anything else. The reply is a list of labels such as READER, POST, OVER, HDR, STARTTLS and AUTHINFO, one per line. Introduced in RFC 3977 to replace guesswork and the older LIST EXTENSIONS, it lets a newsreader decide whether to use OVER or fall back to XOVER.
Browse all terms in Protocol & Server Infrastructure, or see the full Usenet glossary.