Ctrl Engine isn’t like other run-of-the-mill software; it runs as a service.
Services perform automated tasks, respond to hardware events, or listen to requests from other software. In a user's operating system, these services are often loaded automatically at start-up and run in the background without user interaction. (i.e. the way your system knows if a USB drive has been plugged in or not).
It can be set to boot with the operating system, meaning as soon as power is restored, it'll start running again. Similarly, if the system encounters any issues, the services will be automatically restarted.
Ctrl Engine performs like embedded hardware but with the processing power of a desktop system.