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This is a matter of taste - benefits of the server-driven architecture are: no limits from the server, no GWT recompilation, direct access to server-side API and resources, better security, full Java virtual machine, full tooling and debugging support. Downsides are: more client-server traffic, more data to store in HttpSession.

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I think the most impmortnat problem is trying to hide the netowrk under an inhenrelty leaky abstraction: http://www.erlang.org/pipermail/erlang-questions/2008-May/03...

yes that is what worries me - I like network stuff to be explicit.

There are multiple levels of control: 1) for each UI component you can select to send events immediately to server or alongside the next "packet" sent to server. 2) as we are building on top of GWT - you have the full GWT-based RPC also if you want to do the communication manually.

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