This contains all of the CD udp compatability stuff.

The CD protocol is quite neat.  The way it works is you send a udp
packet to the udp port of the machine we want to know about with a
format of

@@@cmd[||arg1:val1[||arg2:val2[||...]]]@@@\n

Where the cmd is the name of the command we want to execute.  The
arguments can be basicly anything.
