Thank you for your replies.
My company designs action-scenes so, at the moment, I am investigating people's results with motion-tracking.
Motion-capture is my own keen interest. I was looking at a system that feeds remotely (ie, a wire-based unit) into a PC. I have been told that I'm looking at stumping up for an Octane II for this opersation, which is what I'll do.
I think there are no boundries with a system like that.
Very interesting.