Oh, it most definitely does. Vertex groups and polygon groups.
In Poser objects I've noticed the vertex groups are almost always the same as the polygon groups - same names, same corresponding points. In the DAZ models that's mostly true.

But OBJ can also support "overlapping" vertex groups, while poly groups can't overlap. Meaning a point can belong to any number of groups, but a polygon can only belong to one group.

The Poser figures made by E Frontier have overlapping groups. My theory is they did it like that to prevent people from making their own morph targets so they had to buy from them. Maybe I'm just paranoid. ;-)
It did seem kinda sloppy to me though, if not intentional.
And I still was able to make MTs, after I figured  out what they had done.

I don't know if the new ...err... "humans"... included with Poser 8 have that going on though.