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Sessions can either be started or joined
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Sessions can be joined either because the master adds a user or because a user requests it.
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Sessions are started from the icons under the tags in the middle of the CA's user interface
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Suppose the teacher has started a chat or other session. Then it appears on the list of sessions at the bottom middle section for ALL clients. Highlighting it, one see that join is an option (shown in left bottom panel)
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Click the join button and you become part of this session
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The chat applet is downloaded to client that joined. Highlighting chat now shows this client as a participant.
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For chat, this happens almost instantaneously. For more complex applications, the registration process takes longer as Tango only accepts a joined client when The Java applet is properly loaded
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