Having just typed out a complete explanation from my much-copied A2 notes, that BASTARD PPRuNe 'you are not logged in' registration bollocks sent it off to cyberspace.
Why, oh why, must we have this bloody nonsense? It is an utter pain in the arse....
I might type it out again. On the other hand.....it is sufficient to say that the 'CFS' explanation is utter rot.