Being a newbie in video editing I don't know the terminology for what I want to do. I want to create teaching videos that while I teach, the image switches to either a graphic image or secondary video, while maintaining the existing audio track. 1. Is there a special terminology for this? 2. Is there a cheap/free software package that can do this? I would prefer to start with a FREE version as I am not even sure what is involved in doing this process and if it is too complex I may not even want to do this and don't want to waste money on something I end up not using. Thanks, Richard..