Google app engine has an amazing list of services you can use to enrich your web application. One of them is the XMPP service. In the documentation is stating :
Important: An App Engine application can send and receive chat messages to and from any XMPP-compatible chat messaging service, such as Google Talk. An app can send and receive chat messages, send chat invites, request a user's chat presence and status, and provide a chat status.
In this sentence are listed all the functionalities of the XMPP service. This is how I have implemented the send of a message to a certain client.
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