Well it depends on what you are actually wanting..I Looked up the definition Instantiation and was left more than a little confused .. Lol.. Can't say I've been the brightest in the batch after undergoing chemo a couple years ago.... But if you are thinking of geometry instancing (as accodring to Wiki or OpenGL Instancing. Then no you aren't as poser doesn't yet support that to the best of my knowledge .. It has the duplication, but it still renders each geometry in the scene as seperate geometry..Instancing as described on the mentioned pages is something a few of have been hoping for. And yes on the swapping bit, I believe it keeps alternates stored in memory (or used to) as when playing with it in earlier versions, I would get an out of memory error after a bit if I kept switching things out back and forth.

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Consider me insane if you wish, but is your reality any better?