I'm really intrigued by the second part...is this a "trick" answer...IE it's not stalled atzero airspeed, simply because there's no airflow to start any lift?
Steve, no trick. It simply requires that the wing loading be zero as well as the speed - at the top of a stall turn for instance (though there's no stall - the US term 'Hammerhead' is better!), or any other 'ballistic' manouvre. This is why if you roll on 90 degrees of bank but don't pull, the aeroplane will not stall. That is quite a good way to 'throw away' an aerobatic manouvre where one has pulled up for it and then decides not to proceed with it.
If there's no load on the wing it won't stall as the stalling angle of attack will not be reached. Conversely, pulling out of the 4th quarter of a loop the speed may be very high but pulling too hard can cause the critical angle to be exceeded (usually on one wing because the ball may not be exactly in the middle), and the result is that wing stalls and the aeroplane flicks, quite violently.