The NetWorKs class is basically a Java application shell. It includes a main() method and handles command line parameters which indicate the desired size of the application window.
The NetWorKs class works with the NWKFrame class to provide a Frame--basically a window--in which the NetWorKsPanel applet runs. The NWKFrame is a package-only-access class that provides a file menu as well handles file I/O. The functionality these classes provide does not require special access to GraphStuff classes.