  This note shows how one can be led from considerations of quantum steering to
Bell's theorem. The point is that steering remote systems by choosing between
two measurements can be described in a local theory if we take quantum states
to be associated many-to-one with the underlying "real states" of the world.
Once one adds a third measurement this is no longer possible. Historically this
is not how Bell's theorem arose - there are slight and subtle differences in
the arguments - but it could have been.
