[Twisted-Python] Where is trial?

I am trying to write tests for my project. According to the twisted howto found here http://twistedmatrix.com/documents/current/core/howto/trial.html I should use trial. When I try to run trial from the command line (Windows) I get the usual "that's not a program I know about" error. The howto says that there's a twisted bin directory that should be in the path, but looking around in my python installation, I see no such thing. I checked lib/site-packages/twisted and /Scripts. What am I missing here? I installed twisted using the executable windows installer. -Daniel