The DeltaGUI is inherently multi-rack aware, and will find all Delta servers on the network if they are not currently attached to a DeltaGUI instance.
You can choose to place servers into a Group (1-64), and then set one server to Master, the others to Slaves. The master server will then broadcast timing information to the slaves over Ethernet.
You view a specific server by choosing its group, then the server by name. DeltaGUI therefore shows one server’s timeline at a time.