can anyone help,,? chroma key and green screen, how do I use them. I am using pinnacle studio 18, on windows 7, plenty of experience with home movies from std 8 . sup 8. until the end of home movies, (special effects were simple to do). I have edited some home videos, but I know nothing about the above, health and age are a bit restricting, so any help or advice would be more than welcome, and much appreciated.