Is there any possibility to record what is happening in session 0 in Windows? Can I accomplish this with some kind of software?
In Windows Vista+ there is no desktop in Session 0, and it's isolated from the user on purpose.
The Microsoft Windows Vista operating system mitigates this security risk by isolating services in Session 0 and making Session 0 non-interactive. In Windows Vista (and Windows Longhorn Server), only system processes and services run in Session 0.
Any service running in Session 0 that needs to interact with a user will have that facilitated via the Interactive Services Detection service, which will allow the console user to flip over and see what the service in Session 0 is trying to tell them:
But if/when they do flip over to "view the message", they won't be presented with anything other than the application needing interaction.
So (as far as I know) you can't "record" session 0 because you can't interact with it directly.