This component is used to interface with Mac OS's MPNowPlayingInfoCenter and related MediaPlayer API: https://developer.apple.com/documentation/mediaplayer/mpnowplayinginfocenter
This includes an interface for MPRemoteCommandCenter, which can be used to receive media-related user input (e.g. media keys and actions that are available through the MPNowPlayingInfoCenter such as repeat and rating). https://developer.apple.com/documentation/mediaplayer/mpremotecommandcenter
Note that these APIs are only available on Mac OS 10.12.2 or later.