Warp wrote:

>   In pin locks designed for master keys some of the pins are cut in three
> parts instead of two. This means that two differently-shaped keys can open
> the lock.

I see...

Actually, I wonder. They call them "pins", but just how strong are they? 
Couldn't you open the lock just by breaking all the pins?

>   (Of course pin locks are quickly falling out of use, at least in Europe,
> because they are so easy to lockpick. Other, more secure lock types are
> usually used, but the master key idea is basically the same.)

Yeah, they all involve the shape of the key moving the internal 
components of the lock around...

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