Starting the TwinCAT 3 Usermode Runtime
The TwinCAT 3 Usermode Runtime can be started via the TcSysUI:

The TwinCAT 3 Usermode Runtime starts in the background.
The router status can then be queried and changed via the same menu.
A minimized window provides additional interaction:
heap memory allocated 000002514EB00000 size=536870912
TcSysSrvUm state: Config [8896]
AmsNetId: 199.4.42.250.1.1
TcSysSrvUm state: Config [8896]
Press 'c' for Reconfig TwinCAT System.
Press 'r' for Restart TwinCAT system.
Press 's' to view current state.
Press 'x' to exit TwinCAT system service.