Stopping Pen

I have a really stupid question. I've downloaded and installed from
source the pen loadbalancer. Unfortunately, I cannot figure out how to
stop the server now that I've started it.

I started using this:
pen -H 4000 localhost:8000 localhost:8001

What command do I use to turn off this forwarding?
Received on Thu Jun 14 2007 - 19:45:41 CEST