I have Poser 3. The .CR2 file format instruction "alternateGeom" would be more useful in changing a part of a model if it would work on any desired body part. E.g. I made a Poser model of an oxy-gas blowtorch with backpck gas cylinders, and I wanted to use alternateGeom to let the user choose between a cutter torch head and a welder torch head by clicking the "Genitalia" menu option. But I found that that would only have worked if I had named the torch head "Hip" and its trigger "Genitals", which would look silly and inappropriate. (Also, an option would be needed to put a more suitable word than "Genitalia" in that line of the `File' menu.) As it was, I managed with an ordinary morph target, and the user would have to delete the trigger in the welder form himself. But if I attempt a AK47 model (posable, as the foldable metal butt, and the butt's end plate, and the off / singleshot / automatic lever, can move), I could not use a morph target to change the folding metal frame butt into a solid wooden butt, as those two sorts of AK47 butt are too unlike in shape and topology, and a texture map UV line layout suitable for the metal frame butt would be hopelessly distorted on the wooden butt, so I would need to use alternateGeom, and WITHOUT having to call the butt and its endplate "Hip" and "Genitals".