Dont know the protocal but it wont do you any good. They do not use MDT's, they use MDC's(Mobile Data Computers). And to my knowledge, MDC's cannot be monitored....
Remember GOOGLE is your friend...I found this just doing a generic search..
That system sounds pretty good, I guess.
I tried to register with your site - was unable to. I think I have cookies enabled ... I'll 2XCheck and try again.