"Mark Zarella" <markzarella at mediaone.net> wrote:
> Perhaps the easiest way of descibing its job rather than the "how" part is
> to say that it simply transmits and transduces signals. Your question seems
> to me to be akin to asking "what is the job of a copper wire in a XYZ
> circuit?" The answer depends on that particular copper wire's relation to
> the other components.
The question's more like that: What is the job of a key? - It is
to open a lock.