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The page indicates that VDCP was based on Sony (BVW) protocol, but it has no commands in common. When I was implementing it in the Tek Profile, Ken Louth said that he had based it on a Panasonic laser-disk player protocol, which offered independent control of two player heads, which is where the protocol between cue-next and play commands originated. Ken indicated that the HP prototype (shown at the same NAB at which Profile was introduced) had a control structure much like the laser-disk player.
