On Windows, you can start OpenVPN by right clicking on an OpenVPN configuration file (.ovpn file) and selecting “Start OpenVPN on this config file”.

Once running in this fashion, several keyboard commands are available:

  • F1 — Conditional restart (doesn’t close/reopen TAP adapter)
  • F2 — Show connection statistics
  • F3 — Hard restart
  • F4 — Exit

More:
https://openvpn.net/index.php/open-source/documentation/howto.html