The tool in use is Qmaster for Compressor and Shake and DVDSP4. It's failry easy to setup but not so easy to manage or run until you've screwed it up a hundred times. You can only use it with machines that have FCP Studio installed or some of the components. If you want to render farm with Compressor2, each machine in the farm must have a valid licensed copy of Cmpresoor2.
This is my standard sigfile so do not take it personally: "For crying out loud, read the freakin' manual."