Rockwell Automation GMLC Reference Manual - Manual (Page 54)

Publication GMLC-5.2 - November 1999
Understanding Your Workspace 17
The Diagram Explorer shows the contents of a diagram. When you select
a module from the Diagram Explorer, blocks and connections appear in
the Diagram Window.
Understanding the Diagram Window
The Diagram Window provides a graphical interface to manage diagram
development and maintenance, as shown in the example below:
A new Diagram Window is active each time you open GML Commander
and each time you select a new diagram. Though several Diagram
Windows can be open simultaneously, only one is active at one time.
Note: Each diagram has a start and end block at the root level with one
or more functional blocks connected together.