@Bejaymac: true, but again that all is just a matter administration. On loading the figure mesh Poser duplicates vertices when the facets they define are members of different groups that have the names of body parts. That's all there is to it. The problems are:

1 This subdivision is not transparent to the user. The .obj that is generated with the. cr2 is exposed and may overwrite the original. That is bad. Had it been named differently, say have extension .pfg (PoserFigureGeometry) and preferably be in a binary format nobody would have known or cared. 

2 Poser does not keep record of the relationship between the original figure mesh vertex number and body part mesh vertex number, or if it does, this is not exposed or utilised: this is again a matter of administration.  Note that the Python method 'unimeshinfo()' yields a weled mesh and a with full mapping of the relationships that is stable on reload.    

3 Same holds for the fbm's. Poser simply exposes more than it should do, and yes this clutters the parameter list to an irritating level. Exposure of parameters, again, is just an administrative thing.