[__david__]

This is one of the huge reasons I'm still an emacs user in the face of so many IDEs. Until you've used emacs for a while you don't realize that emacs was built in emacs and has great tools like the ones described in the article to poke around its innards.

Writing emacs lisp in emacs is a joy because it's so easy to drill down when things don't work and figure out exactly what is going on.