where does polymorphism occur?

[Graydon Hoare]

Hi. I've got a small question I can't suss from the corba documentation:
where does corba polymorphism occur, at the idl level or at the C++ level,
or both?

I've got an object which inherits a method from its parent, and I want the
implementation to specialize the call for a certain subclass of the
argument type. Do I need to write the specilized form in the IDL in order
to marshall the call properly, or will C++ vtbls do it if I just implement
an overloaded form?

thanks
-graydon
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