> 'sallright.  If I you give me a pointer to something to read to
   > understand how to single-step through the code, that'd be great.
   
   If you use Xemacs there is an info node. GNU Emacs seems to lack such a
   beast. That's annoying. There is still the keybinding stuff in debug
   mode and all. Call it up '(debug)' in a lisp interaction buffer, maybe,
   and C-h b to get the keybindings.

If  you download  the  elisp manual,  you'll  find all  sort of  things,
including an entire  chapter on debugging emacs lisp.   You will find it
on any GNU mirror.

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