Or is it more a taxonomical device used to deduce as to whether or not a given agreement for accommodation is legally to be deemed a tenancy?
In other words, considering the following quotation from the law lords' decision...
"The manufacture of a five pronged implement for manual digging results in a fork even if the manufacturer, unfamiliar with the English language, insists that he intended to make and has made a spade,
...can it be said that exclusive possession is more akin to the number of prongs required to render something as that which may be described as a fork, rather than any legal stipulations as to the prescribed conduct surrounding forks?