Yahoo! Messenger Protocol

Yahoo! Messenger Protocol

Yahoo! Messenger Protocol

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<!-- Deleted image removed: -->The Yahoo! Messenger Protocol is the underlying network protocol used by the Yahoo! Messenger instant messaging client, for Yahoo!. Yahoo! Instant Messager supports many features beyond just messaging, including off-line messaging, file transfer, chat, conferencing, voice chat, webcams and avatar.


The purpose of the YMSG protocol is to provide a language and series of conventions for software communicating with Yahoo!'s Instant Messaging service. In essence YMSG performs the same role for IM as HTTP does for the World Wide Web. Unlike HTTP, however, YMSG is a proprietary standard, aligned only with a single messaging service provider (namely, Yahoo!). Rival messaging services have their own protocols, some based on open standards, others proprietary, each effectively fulfilling the same role with different mechanics.

One of the fundamental tenets of instant messaging is the notion that users can see when someone is connected to the network &mdash; known in the jargon as 'presence'. Yahoo!'s protocol uses the mechanics of a standard internet connection to achieve presence, the same connection it uses to send and receive data. In order for each user to remain 'visible' to other users on the service, signaling their availability, their Yahoo! IM client software must maintain a functional, open, network connection linking the client to Yahoo!'s IM servers.

As some organizations block communication on the port used by Yahoo!...
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