Create a MUC room for every screen and join / leave it as appropriate. Then
display the room roster in place of the users roster you currently have.
Much easier :-)
Hm, that's clever but I realize I may have misstated the situation a
bit. The user doesn't merely need to know whether those other contacts
are looking at the same screen as they are. He/she needs to know
whether they're online at all
Same pattern, use another online@ MUC for tracking everyone who is
online. This can be rather noisy if there are many users online but if
you limit this one to simple join/leave and don't send away updates to
that room it's ok.
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