I worked in IT for many years, and for at least the last twenty the rule has been 'lock your screen when away from your desk' - to stop anyone from seeing data they weren't meant to.
I was somewhat astonished by the measures taken in A and E at the Lister, on a laptop used by nurses in a public area, and often left unattended.
It was used - among other things - to track progress of patients through A and E, and a nurse used it when I enquired about progress on finding Viv a bed on a ward (at which point she asked me to stand the other side of the screen, because there was confidential data on other patients visible). I did wonder why the screen wasn't positioned better, so that visitors wouldn't see the data - or why it didn't have a polarised filter (about £25 on Amazon) to prevent unwanted viewing.
When the laptop was left unattended it was left unlocked, with a sheet of A4 paper over it, fixed by a length of tape. That's all. I was tempted to do a quiock ctrl + alt + del on the keyboard and see if anyone knew the password!
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