[Zope] How do you changing web port address of Zserver installed as a se rvice on Win NT4? rvice on Win NT4?

I am looking for some guidance on how to change the web port address of my Zserver. I can use the -P option START.BAT file and start it manually but I haven't been able to figure out how to change it when I am starting the Zserver up as a service on a WinNT 4 box. It works fine on port 8080 but I now need to move it off of that port.