External systems are a special form of virtual systems. A real SAP System is used in their place to perform actions on the transport directory. They are different from virtual systems in that they have their own freely selectable transport directory.
You can use external systems to:
If you want to transport between systems in different domains, we recommend that you link domains with domain links.
To configure an external system:
The system overview appears.
The Evaluation: Configure external system dialog box appears.
Enter the transport directory path for the specific platform and relative to the communications system. The transport domain controller is proposed as the communications system.