Yep, after some running around, I got access to the switch room, and watched the lights go out as I unplugged couple machines. Low tech, but yea, it worked. I wasn't sure if I would be able to get access to the switches, so I was trying to find a way to do it via network, but the switches aren't configured with IP addresses...

Anyway, found out what I needed.

Thanks to everyone!

RMSe17