Hotspots and Parents

I have a hotspot and am trying to add another hotspot anchored close by which gives it a little funky orbit around the parent.
Is there any more information about what is going on here?

BTW, just grabbing the parents ath, and atv and using ox and oy does what I needed. The orbit thing is interesting as well. I'd like to know how to control the radius.

<hotspot name="spot_eingang" style="arrowspot1" ath="1" atv="40" scale="0.40" onclick="transition(spot_eingang, 1.0, 0.0, 0, scene_eingang, -86, 3, 45);" />
<hotspot name="spot_eingang2" parent="hotspot[spot_eingang]" style="arrowspot1" x="100" y="100" scale="0.10" onclick="transition(spot_eingang, 1.0, 0.0, 0, scene_eingang, -86, 3, 45);" />

So I'd like to setup hotspots with other hotspot buttons offset, and be able to drag the hotspot with its buttons.
But the hotspot parent system isn't documented or working properly.
Klaus, can you shed some light here?

Thanks it works!
ox and oy for positioning.