Re: Just "193 Atomic Functions"?
I do not think that they are talking about database transactions here.
From the article:
"All of the operational roles performed within the London Area Control have a unique identifier known as an Atomic Function".
Together with th mention of "signing off" and unused station, I understtod that "active Atomic Functions" was related to the number of ATCs logged in. Other information about operator mis-keying while logging out might point to a poorly programmed log-out sequence that permits the operator to be apparently logged out without releasinf their "Atomic Function" token.
Just my guess.