This means we can add it to our windows startup and our VM can start with windows.
There is now a command line option for starting your VMs without having to open the UI. Thankfully Version 5.0 has been recently released and it will finally handle this for you. I always found this to be a bit of a pain that VirtualBox didn't support this 'out of the box'. If you wanted to start a VirtualBox VM headless (no UI) in the past, you needed additional tools.