“An IETF proposal to turn iCal into a client/server system. CAP defines how calendaring clients, or user agents, can access and manipulate date in a server-based “calendar store.” CAP uses BEEP for authentication and security.” (from http://www.nwfusion.com/links/Encyclopedia/C/847.html)

The draft is available here: http://www.ietf.org/internet-drafts/draft-ietf-calsch-cap-10.txt