A controller handles control events in a system of networked home devices by: receiving a signal indicative of a control event, which is an actuation of a user input device; and in response, determining whether to perform a control function associated with a networked home device, that determination being made in dependence on a state of interaction between that device and a physical environment in which it is located at a time of the control event. If the control function is performed in response to the control event, it causes the networked home device to perform an action that changes the state of interaction between that device and the physical environment in which it is located. Otherwise, the controller causes another control function associated with a different networked home device of the system to be performed in response to the control event instead.