Hi, Arne (and others).  Sorry for slow response, and thanks for your
input.  To respond to your question, I think for now we have two
scenarios, when we simplify things.  Let's say we want to visualize
some arbitrary data (e.g., a google map) in one entity, while
controlling it from another entity (e.g., a "joystick" that moves the
map around).  (The reality is more complex, with multiple views of
different data sets, but this is illustrative.)

1) Scenario 1: the map/joystick are all on the same user's page.  I
assume you're suggesting designing one huge "gadget" in canvas view
that has a bunch of different entities in it that can all share the
same data space?  Is that right?

2) Scenario 2: I want to show another user (logged in separately)
something.  I move the joystick on my page and the map on their page
moves.  We will need a server (e.g., to serve up the data we're
viewing), but most of the gadget communication methods I've seen only
allow for _polling_ the server, not listening for callbacks when data
arrives.  That's not what we want long-term.

Regarding pubsub, I see how straightforward the interface is, but I
still don't know what it's capabilities are.  You say it won't allow
us to pass data between different users, in which case I agree that it
doesn't add much.

So is there any way to pass data between users without polling on the
receiver side?  I found one example of a Talk application, but I don't
want to run in a chat box.

Thanks,
Rob
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