Nikon Creative Lighting System at Nikonians : Nikonians have published an article by Nikonian Darrell Young (DigitalDarrell) explaining the use of the Nikon D200's Speedlight Commander. Darrell takes the mystery out of Nikon's Creative Lighting System with a step by step guide to the built-in Commander Mode Speedlight controller of the Nikon D200. The Nikonians article will have readers quickly grasping not only the principles of this integrated lighting system, but also show how to put it to practical use by combining the built in- pop-up Speedlight with two external Speedlights designed to take sophisticated commands from the Nikon D200 digital SLR camera. CLS (Creative Lighting System) is an advanced wireless lighting technology. You can read the full article here