In the Window-Oriented View Hierarchy we looked briefly at four different kinds of views, which are instances of the following classes (or subclasses):

The following diagram shows these and other classes that derive from IlvAbstractView.

These views classes give rise to actual windows or views that are displayed on your screen. When you instantiate one of the derived subclasses of IlvAbstractView, the object you obtain is referred to as a view. A window  on the screen is, in fact, an associated set of one or several views.