In my current job I am an admin working with Macs in a school district. I previously worked in a district that had an interesting option for local tech accounts to bypass the logged in user by pressing opt + cmd + enter. This presented a blank login name and password, you put in the tech account, and then you were on the desktop of the logged in user. This was helpful for some troubleshooting we did, or when we wanted to login and properly log a student out of a computer, making sure to save their work if they left the computer and went to another class.
I am wondering how that was setup.