Thanks allstereo, understanding what these PoserPython functions are returning is the first vital step, so I'll download your items when I'm back on my own system - they should definitely help. I did check the quaternion article on Wikipedia, and it was all gobbledigook to me :oS ... I couldn't understand what it was taliking about !

What's puzzling me most about the multicoloured results I noted is what exactly do the tuples returned by actor.AlignmentRotationXYZ() and actor.Orientation() represent?

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident. And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU or something else.
*soon only to be available in two flavours -  DAZ and Renderosity