Scan your WiFi network and connect to your Windows machine using the ServerControl iOS app.
Note: You can use the ServerControl app when out of the office however that requires you to access your windows machine via a VPN.
Tap on Service Control option.
In this example let's restart the Print Spooler. Tap on it.
Then press 'Stop'. Once it's stopped the button will change to say 'Start'. Simply tap it again to start the service. And that's it.