Re: Yes, but
"My suspicious nature leads me to think it might be more about monitoring who is/was on a machine."
Even if the research wasn't carried with this in mind, it's a fair bet it's going to be used for this purpose. Given the news that the UK police have been quietly squirrelling away 18m photos on their national database, how long before they pick up on this new means of suspect identification?
PC: Right, that’s your fingerprints and mugshot taken...
SUSPECT: Is that all then?
PC: No, no. Now you sit in front of this computer and play minesweeper.
PC: You heard! Get clicking and find those little bombs …
SUSPECT: (MUTTERS) Minesweeper? Who plays that these days?
PC: I heard that!