[Staffslug] UPS shutdown FreeBSD Box

Hi all, I've got an APC UPS that is currently powering my 24-port cisco switch and my server. My server is running FreeBSD but doesn't have a serial port which the UPS needs for emergency shutdown. I'm soon to be adding a Winblowz server box into the network for testing, that box will have a serial port and can therefore run shutdown scripts when it is told that the power has f00bed and running on battery. I need to work out a way of running the shutdown command on the fbsd box from windows automatically such as within a batch file. I'm not entirely sure how i go about getting a windows box to shutdown a fbsd box remotely so does anyone have any ideas? All i've come up with is setting up a user that when they logon runs "shutdown -p NOW" and kills the server safely...then have a windows script to call putty, login and then issue that. Again...i'm not sure how to go about it. Cheers, Joe