A distributed blackboard to write text and draw simple pictures using JXTA. Each working session is identified by a name. At startup the application searches for the already active sessions or allows to create a new one. After joining an existing session the user sees what is written and drawn by the other users part of the same session. The system must guarantee a causal ordering among the actions (of writing and drawing) performed by all the users part of the same session. We assume reliable processes.
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