First, is the "developer" mode. Here the developer can create a Jython Control, specify the name of the display, any data categories, the probe type and write the Jython that creates a GUI and responds to data, animation time and probe position changes.
The default Jython code has examples of accessing data, etc.
The second mode is "user" mode. In developer mode you
can write out an specification of the Jython Control to a plugin
through the File->Save->Write to Plugin menu.
This plugin, when loaded, will only show the user interface that
is created by the developer written Jython.