Official and legal recording. Though in all honesty, without the smell of the house lights making those actors sweat and panic, it's just a shadow of actually attending.
I was watching yesterdays Dallas, and Mitch Pileggi (Skinner from X-Files) was going full on Bates. His overbearing mother (Angela from Who's the Boss.)had been sawing his balls off slowly for the last 4 decades, untill he finally acted out on all those frustrating years of being harmfully emasculated at he top of a staircase... And he was calling her "Mother" too.