Ahhh... I think I have continued to misspeak!
By numerical I meant when you have say an archive and you have *pages* of results. i.e. say 8 excerpts on the first page, 8 more on page two of the results, etc., etc.
So.. to see I can be more clear.. ...to give the viewer the choice of Alphabetic Pagination or the standard (likely date-based) choice of page 1, page 2, etc. of the results.
Then revisiting my original question as well... What happens with your Alphabetic Pagination if someone selects "D" and there are more than one page of results? Does it then display numbered pages of results?