After requesting a Tango download of control applet, one may get a security dialog (grant permission to download and remember decision), and first one is asked (as on previous page) to choose a server
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Servers are available for distribution but typically start with default one
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one also asked to choose a "control interface" which just correspond to different selections of applications to share
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After a while, if all goes well, one gets the request to "login" which currently just requires that you type in a unique "handle" by which you are known in the collaboration room.
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In Tango1, each server supports a single room but we will see that although all users are potential participants in a shared application, one can set up complex relationships as any given session can involve a different subset of users.
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Currently Tango has no security mechanisms in the login process although one has some control over allowed actions in a given shared application.
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Note we define a session as an instance of an application shared by a set of users. One can have any number of sessions based on a given application which separate instantiations of the application and different subsets of users. As we will see users decide who joins a given session.
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