An application that divides the user's display into two or more windows that can be scrolled independently WordNet 3.0 & Open English WordNet

A frame, or group box, is a type of box within which a collection of graphical control elements can be grouped as a way to show relationships visually, either because the items are functionally related, or because they apply to related objects. Wikipedia

A box used to hold other widgets in a graphical user interface Wikipedia Disambiguation