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SIMPLE

(SIP for Instant Messaging and Presence Leveraging Extensions) Enhancements that add instant messaging and presence to the SIP protocol. Developed by the SIMPLE working group of the IETF, SIMPLE adds buddy list subscriptions and notifications and instant messaging commands.

SIMPLE has two modes. Session mode, which is the more efficient mode, sets up the call and provides a raft of features including conferencing. Page mode uses no call setup and is more like a short messaging service for delivering one-shot messages and announcements.

The IETF's Instant Messaging and Presence Protocol (IMPP) working group, from which the SIMPLE group was split off, focuses on helping people build gateways to SIMPLE from other IM systems. In 2001, AOL said it would support SIMPLE, but subsequently abandoned its plans. See SIP.

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simple

1. Chem (of a substance or material) consisting of only one chemical compound rather than a mixture of compounds

2. Maths

a. (of a fraction) containing only integers

b. (of an equation) containing variables to the first power only; linear

c. (of a root of an equation) occurring only once; not multiple

3. Biology not divided into parts

4. Music relating to or denoting a time where the number of beats per bar may be two, three, or four

5. a plant, esp a herbaceous plant, having medicinal properties

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simple [′sim·pəl]

(biology)

Made up of one piece.

Unbranched.

Consisting of identical units, as a simple tissue.

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1.		SIMPLE - Early system on Datatron 200 series. Listed in CACM 2(5):16 (May 1959).
2.		SIMPLE - Simulation of Industrial Management Problems with Lots of Equations. R.K. Bennett, 1958. Predecessor to DYNAMO, for IBM 704.