Vernon's odd behavior

[Michael Perry]

No: HPFGUIDX 160361

> Edis <virpshas at tiscali.co.uk> wrote:
> > But could Muggles get into a Secret-Keeper protected 
> > property?
>
> Random832:
> Why not? Dumbledore told them the secret, we all saw that. 
> There's no reason to think that's not enough - that's how
> the protection works, it's not wizard- or muggle-specific 
> in any way.


Michael:
But isn't the Black house protected beyond this? Harry had 
to be shown a piece of paper (filled out by DD???) with the 
key to the house. He had to invoke the key to get into the 
house, as I recall.

Could Muggles invoke such a key? Why have HP invoke it, if 
the house isn't hidden from all who haven't invoked it?