I see that Smalltalk is still living in darmstadt :) or resurrecting.  
Say hello to mira from me.
Can you tell us what you would like to do just an idea?

I'm curious to also know this answer to your question.

> Hi,
>
> I'd like to do some VM hacking. In particular, I'd like, as a first
> step, to add a field to the ContextPart class. That does not work in
> Squeak itself; it keeps telling me that this class cannot be modified.
>
> So far, that's understandable.
>
> But what steps do I need to take to add that field to the class? I
> have obtained the VM sources, but where in there is ContextPart, or
> its counterpart?
>
> Thanks for any hint,
>
> best regards,
>
> Michael Haupt
>
>
>