What was Direct-Eval RPC, and why didn't it work ?

The documentation mentions a feature called Direct-Eval RPC[1], saying it didn't work as planned, and is now discouraged.

What was it, and why is it now considered a bad idea ?

  [1]: http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html#DevGuideDeRPC

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