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puting">computing, SIMPLE (Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions) is an instant messaging (IM) protocol. In contrast to the vast majority of IM software deployed today, SIMPLE is an open standard.SIMPLE applies the Session Initiation Protocol to the problems of:Registering for presence information and receiving notifications when such events occur, for example when a user logs-in or comes back from lunch.Managing a session of real-time messages between two or more participants.SIMPLE is currently (2003) IETF work in progress, taking place in the simple workgroup. Some parts have been standardized, e.g. RFC 3428. Other parts, in particular IM sessions, are still under discussion. However, several implementations are already available, notably including the Microsoft Windows Messenger. See more at Wikipedia.org...

binatorics">combinatorial mathematics, a combination of members of a set is a subset. A k-combination is a subset of S with k elements. The order of listing the elements is not important in combinations: two lists with the same elements in different orders are considered to be the same combination. The number of k-combinations or k-subsets of set with n elements is the binomial coefficient "n choose k", written as nCk, nCk or as See more at Wikipedia.org...