What ports does your Remote PC Shutdown 3.60 use?

I work in a library where we have many pc's available for public use. We have the computers locked down so patrons cannot install programs but since yours is just a file download they can run it. Great program but kids have been using it to send vulgar messages and reboot other computers within the library. If we can't find a way to stop this and other programs like it we will be forced to futher restrict patrons and not allow downloads of any kind. Thanks, jeff