B-29 Throttles Question

Hello,

Realize this isn't the correct forum for this, but I feel sure that
someone here will know the answer.

On the WW II B-29, or on a B-17, the Flight Engineer has a set of
throttle controls.

Also, I believe, the Pilot.

Are they interconnected by cable ?
If one moves, therefore, the other physically moves also ?

Or, does one switch, somehow, actual control to the other, at some time,
and their's then becomes inoperative ?

Or,...?

How does this work, and function, please ?

Thanks,
Bob

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