Wifishield FTDI debug command: ttcp

Could someone please explain the ttcp command? I roughly get a sense of most of the commands in the serial debug interface. But this one is very unclear. It is vague studying its source code. There is no entry spot for the actual data that gets sent, and even if there is some static data that gets sent, my nc session does not pick it up. it does not seem to work???

I usually try the command doing ttcp -t which is the IP on the router to my local computer, which is listening via netcat on default ttcp port 2000. Anyways, I'm in the dark and will be skipping.

Also when I try ttcp -r ... I don't get any visible results. .-.