High Quality Content by WIKIPEDIA articles! Application Exchange (APEX) was an early proposal to the IETF of a standard protocol for instant messaging. It was based on XML, but is no longer being considered for use. Today, SIP and SIMPLE, and XMPP are currently being discussed for use as an instant messaging protocol. Proponents of APEX have now mostly put their support behind XMPP as it is also based on XML. Instant messaging (IM) is a form of real-time direct text-based communication between two or more people using personal computers or other devices, along with shared software clients. The user's text is conveyed over a network, such as the Internet. More advanced instant messaging software clients also allow enhanced modes of communication, such as live voice or video calling.

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