Okay, I just did a model in Blender for Miki 4 and had a heck of time trying to map it. I haven't figured out how to unwrap stuff in blender yet. But that's not my question. I was told that I had something on the order of 200 or more duplicate vertices and several tris that I didn't need.

How does that happen? As far as I can see my vertices are all accounted for , so how do I find any duplicates and get rid of them?

While in edit viewSelect all vertices

Open tool side window ( hit T on keyboard )

And click remove all doubles

That should do it

see my post in other thread !! the dups are down to how poser sees groups!!!

do what thewebflea says will remove your dups but then you will put them back when you poserize it again

Will that remove free floating vertices too?

In edit mode go to Select>Loose verts/edges.  Then click "X" and delete vertices.  This will remove any floating vertices and edges.

If you are doing the grouping in Poser that is the problem.  Apparently Poser's export function hacks the model by group objects instead of vertex groups.  If you set up the vertex groups in Blender you may be able to avoid the problem.