Health Care & Windows Risks

I recently observed a health care diagnostic system (made by Milwaukee based GE/Marquette electronics) that used Microsoft’s Windows software. While the system collected data, somehow, another network user took over the screen (!), likely via a terminal sharing tool (PC Anywhere or similar). I wonder what the virus/work risks are?
It sure seems like firms have put a very large tool – windows – into places that it may not make sense, such as atm’s, cash registers and medical devices among many others.
Network world has been looking into this.