Colin Putney wrote:
> I second this idea. I did the same sort of thing when fooling around 
> with different ways of representing code using packages. It's 
> surprisingly easy, and a great way to experiment with stuff that would 
> be really difficult to do to the core system without breaking it, at 
> least temporarily.

Wow! I'd love to hear more detail about how this kind of thing is done. 
Where are the main gotchas? Where does one *start*?

Tony