Hi Werner,
thanks for your answer.
I have posted my question and this comment in comp.lang.labview, but the comment didn't appear here. So I will try it here (sorry if it appears twice):
Do I need additional hardware for the parallel port solution? Is the
parallel port a standard interface for a (standard) foot switch? There
must be additional logic in the switch, right? Do you know of such
foot switches?
Regards
Johannes