Comment by bryanrasmussen

My head canon was essentially that the nutrient connectors in the back of people's necks also had a weak wireless near range communication port to the computers wireless net. Why, because sometimes malfunctions and accidents can happen and people get detached and they need to be findable.

The Oracle had realized years before that this could be used to relay shutdown commands to nearby machines because relatively lax security on this port and had built in the capability into "the one" as a failsafe.