In the lab of my college, when I start a computer, after the boot it appears a screen with virtualbox logo that ask to my wich os i want to start and I can choose windows or linux. If i login in any of this os, and then i shutdown the os I'll be redirected again to this screen, in wich there is also the real button to shutdown the pc. Each pc has it's own configurations, settings and storage memory. There are about 30 pc.
This architecture is working also if the computer is not connected to any network (I've tried with lan cable detached).
So it seems that virtual box is working as an os, like vsphere, but of course it's not in this way.
I'd like to achieve the same result on my home pc. But I don't know what to search on google and how to do this.
I'm already able to create a classic dual boot, but I want to learn this way for my personal knowledge.
I've found this following link on google, but onestly I haven't figure out so much from there.
Does anyone knows an exact procedure to do this? Could you explain what they have done?
The tech guy don't want to explain how they did :-(
The only things that I've found on internet is how to start virtualbox as a service on startup. But I think that this is something that has to happen on boot instead of after the os start.
Thank you very much