Tango can share any client or server application whose state can be determined and set. Tango finds the state from the master and transmits it to the slave clients
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For efficiency, Tango usually transmits "the change in state" and not state itself -- for spring it is as easy to transmit absolute state x as change dx in state. For chat, change in state (latest text typed) is natural.
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For server applications, one finds and sets state through web interface which can be URL (perhaps with CGI extension) or even CORBA interface to a distributed object.
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