What is XMPP?
XMPP (formerly named Jabber) is an open decentralised instant messaging network. Unlike usual proprietary systems like MSN or ICQ, there is not a central server owned by a company, but a lot of different interconnected servers. KDETalk.net is one of them.
How to Register?
If you are a user, you can register a kdetalk.net address with any XMPP client. Here are instructions how to register.
If you are a contributor of the KDE project, you may ask by mail to obtain the Jabber ID which match with your @kde.org address.
If you encounter problems, or simply have questions, you can send a mail to firstname.lastname@example.org.
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