We logged into the machine, ran the app, leave the computer, person A would go up and "log in", except everything wouldn't be right as it's not their account, s

We logged into the machine, ran the app, leave the computer, person A would go up and "log in", except everything wouldn't be right as it's not their account, so they just logged out and back in for real. All of the details were saved on the schools networks drive for later shenanigans like the wallpaper stuff. It was very basic.