The phrase "not officially supported" is not a typo. Perhaps you're assuming that the phrase is equivalent to "doesn't work"? That's not what it means. It means it isn't officially supported. They could remove it or make it do something different or do nothing anytime they feel like. It may not work the way it is documented. They may not fix it if you find a bug in it. Etc.

A while back, Whichway, while investigating the IDL settings, posted a screenshot of the D3D settings he used in a render, where he had the first IC set to 200. Stewer replied:

Quote - The one set to 200 is the occlusion cache, which doesn't get used at all in this case - that one's for AO only (and internally, Poser clamps it to a max of 100 anyway).

The deciding factor here is the second IC parameter.

I suspect, although Stefan has never spoken about it, that IC=0 is not 100% error, because, similarly, Poser would clamp that at 1.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)