Picture-in-Picture - (PIP) - (Window-in-window Viewing) - Picture-in-picture is when a program (channel) is displayed on the full TV screen simultaneously as one or more other programs (channels) are displayed in smaller windows.  http://en.wikipedia.org/wiki/Picture-in-picture Channel Mix - (Mosaic) Mosaic Simultaneous Viewing - A collection of elements (channels) displayed in little windows on a single TV screen.