Emergency Medical Holographic Channel
The Emergency Medical Holographic Channel, or Emergency Medical Channel, was a special communications channel used to communicate with the EMH on a starship. It could be accessed by activating monitor input 47. (, , , , , )

In 2373, Tom Paris piggybacked an urgent message to The Doctor from a Class 2 shuttle on a fake Kazon signal being sent to 's bridge. He reasoned that nobody would be monitoring the frequency. ()

Communications technology