The System area is used to enter and display in the name of the system.
You can browse a system by entering its name into the System area. You can click the 
button at any point while you are typing to complete the name, or display a dialog listing the possible completions, as appropriate.
The members of the system are displayed in the graph area.
If you wish to browse the parent system of the current system, choose
Systems > Parent
. The parent of all systems defined in the image at any time is called the
ROOT-SYSTEM
.