APPLE INSIDER
An Apple TV remote or an iPhone could be used to control multiple devices in a room, with the user selecting what hardware to control by gesturing their hand-held controller in the general direction of the item they want to command.
The Apple TV Siri Remote is only one of many remote control options on the marketIn the beginning, remote control systems were created so that one controller could affect one device, such as a TV remote controlling a single television. As technology progressed, it became possible to control multiple devices using the same controller, such as one that could control both a TV and a VCR.
Source: APPLE INSIDER