A question about client vs server?

[Jarulf]

It's most definitely not like D2.  Nor is it completely dumb.

The answer is somewhere in between the two.

The scripted (customizable) part of the UI does not calculate numbers itself (except for some trivial calculations like percentages).  All the actual numbers are passed by the closed part of the client.  Without reverse-engineering it is difficult to say exactly how much comes from the server, but it is clear that most important data is server-controlled.
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The question was not of control. I assume everything is server controlled (and with some bad exceptions in the start, most was in D2 also actually). What I asked was if the client calculated things in parallell. This can be good if you want to prevene lag effects. If the server tell the client the stats of the player, the client can for example calculate (assuming it has the ability to "parallell" calculate) estimate with a good accuracy if a spell will hit, what the damage will be and so on. Obviously it then updates with the server's result, but that was not my question.