This ID is used to identify you to other users of the chat application. If you are not logged in, the server will assign you a unique ID. The server then checks to see if you are already logged in to the chat application. When you log in to an XMPP-based chat application, your computer contacts the server that hosts the chat application. XMPP is used by a variety of instant messaging applications, including Google Talk, Facebook Chat, and WhatsApp. XML is a markup language that is used to encode data in a format that can be read by computers.
XMPP is an open protocol for instant messaging and presence that uses XML to exchange messages and presence information in real-time. In order to understand how XMPP shares presence information in instant messaging, it is first necessary to understand what XMPP is and how it works.
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