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What is the difference between chroma key and green screen? - key pinnacle tv center pro

I want to buy the video editing software from Pinnacle, but I can not investigate further and to decide between Studio Ultimate. Thus, any suggestion that it would be nice.
But my real question is, what is the difference between a green screen and green? I understand that his way of using your own wallpaper for a video. Both Pinnacle Chroma Key, but only the latter has a green screen. What is the difference?
And I need a special kind of green screen to buy one of these?