[Mike O]

I have been studying up on discerning finish swivel from the hinge action. The Colin Nealmen videos going through the basic motion, to aquired to total have helped me see the distinct differnce between swivel and hinging.

What is the difference between horizontal hinging or any hinge for that matter and Acc 3. Is ACC 3 the same as hinge action and therefor more acc 3 be also considered horizontal hinge action, slightly less be angled, and zeroing out Acc3 be the same as a verticle hinging. No - see answer one.
If one swings with Horizontal hinging and uses a sequenced release then do they automatically use Acc 3 No- See answer Two.

Answer One
"7-10 Hinge Actions describe and control the manipulation of the Hands through the Impact Interval."
"6-B-3-0 Power Accumulator #3 is formed by the angle established between the Clubshaft and the Left Forearm."
The number three accumulator is established when you take your grip and it doesn't impact or determine what hinge action you could make through impact.

Answer Two
You could have a zero number three accumulator and have a sequenced release and also have any hinge motion but to answer your question- yes you could have horizontal hinging.