My understanding has been that Poser doesn't really apply subdivison in the sense that Blender, say, does (applying it to the actual geometry), but merely applies the smoothing during the render process. 

I think the Poser smoothing was being called "micropolygon smoothing" around the time Poser 5 introduced it.  Googling that phrase seems to bring up references to the Reyes which you mention. 

Not too informative.  Sorry.    I'm sort of hoping someone more knowledgeable will come along to address the question.  I'd like to know, too!

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.