> I imagine easily that the VM has some knowledge that some methods are 
> really defined on this class.

Actually no. None of the primitives in SystemDictionary depend on being in
SystemDictionary.

> 	- How can I find the methods that are called by the VM 
> on Smalltalk?

There are none. You are free to move any of the primitives to any place you
would like.

Cheers,
  - Andreas