On Wed, May 13, 2009 at 9:02 PM, Oliver Heins <olli@sopos.org> wrote:

> Hallo Wolfgang,
>
> Wolfgang Schuster <schuster.wolfgang@googlemail.com> writes:
>
> >>> Oliver Heins wrote:
> >>>> Hallo,
> >>>>
> >>>> I try to send a message from a pdf to a webserver.  This works fine,
> >>>> unless the URL has a `#' in it.  Then TeX throws an error:
>
> > Did \letterhash work?
>
> Yes, thank you.  I tried to figure out where \letterhash is defined, but
> couldn't find it out grepping through the sources.
>

maybe  in catc-sym.tex at line 27  ?
.catcode `.# 12 .xdef .letterhash            B.string#E


-- 
luigi