tree wiki:
>This article is about the biological organisms known as trees. For other meanings of the word see tree (disambiguation). A tree can be defined as a large, perennial, woody plant. Though there is no set definition regarding minimum size, the term generally applies to plants at least 6 m (20 ft) high at maturity and, more importantly, having secondary branches supported on a single main stem or trunk (see shrub for comparison). Compared with most other plant forms, trees are long-lived. A few species of trees grow to 100 m tall, and some can live for several thousand years.
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simple wiki:
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.
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