 A central Web site initiates the timing using Network Time Protocol to keep the local computers synchronized, and each location has a small Java program that controls a device which interfaces with the USB port to which one's holiday lights are connected.In this way, anyone online can "plug in" to this network and at their discretion, working independently or synchronized, engage their holiday light display on a global level.Incandescent (midget) or LED-based sets usually have each lamp connected in series to be powered without a transformer in the set.