automatic vpn

Hi all

I have a customer who wants to be able to set up a windows vpn client
to their office, but doesn't want to have to set it up manually on
each machine he visits. Is there a way of automating this? I.e. an
exe file or something similar.
I know that this is dangerous and putting it on any old machine is
virtual comercial suicide if it gets in the wrong hands but he will
not be put off the idea.

Any light youo could shed I would be grateful

Kind regards
Lewis