Channels are the primary tool for scheduling how content will play back on players. Channels are programmed with schedule items that define when and how content will be played back. Schedule individual content items to play in the channel or, for more complicated scheduling, add playlists, which are sub-schedules of content. Once the channel is programmed, tune as many players as desired to the channel and all the necessary content will automatically be downloaded to the player before the channel starts playing. A great advantage of channels is that if the operator needs to change what is playing on the players, just edit the channel once and all players tuned to that channel will automatically be updated. There is no limit to the number of channels that can be created.