I was beginning to wonder if it was like being in the Freemasons within pprune
It might be a quirk of vBulletin, but I've noticed this over the years on pprune with various posters with different names, join dates etc, though I never tried to click on the username to see the profile. I'm more intrigued by what 'registered user' actually signifies, as I thought anyone
with a username was registered
SHJ