Application Configuration Access Protocol

ACAP is the Application Configuration Access Protocol, an internet protocol for accessing client program options, configurations, and preference information remotely. ACAP is a solution for the problem of client mobility on the Internet. Almost all Internet applications currently store user preferences, options, server locations, and other personal data in local disk files... ACAP fills a niche somewhere between a full-blown directory service, a file system, and specialized single-service protocol support.

This doesn't appear to be used much yet, other than in IMAP clients.

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