After a Z-Out your station will switch over to the End of Day screen. To shutdown the station simply click "Power Off Computer", this will initiate the shutdown command in windows.
MANUAL SHUTDOWN
Note: A keyboard is required for manual shutdown.
A manual shutdown can be performed at any time but keep in mind if you are shutting down the server station the rest of your
stations will not function until the server is turned back on.
Windows 7 Station
Windows 10 Station