An individual web page can be broken up into multiple panes called frames. The definition of this subdivision is done by the FRAMESET element and thus the Frameset class. A simple document file is used to contain the Frameset and it's contents. HTMLgen provides the FramesetDocument class for this purpose. The characteristics of each frame are specified in the FRAME element. Typically the frame just points to a source file for it's display contents. Each frame has a name declared by which it may be refered to by other Href tags using a target attribute.
The resulting heirarchy looks like this: