Cougar is spot on – I answered the door one evening in 1991 – lady collecting demographic data, two,weeks later got a follow up visit saying we fit a hole in their panels makeup and could they please fit a box to our tv and video, and pay for the tv licence and phone line rental.
Each of us had a profile sved to the box and we logged in with a remote when we entered or left the room. It downloaded the info at night. Guests could also be added on the fly so we used to mess with their figures by logging in as odd profiles to watch odd programmes – oh yes, it was a barrel of laughs in our flat!