Quote - ... thing is i dont know if poser understands multiple uv's on an object?

Strictly speaking Poser only uses one UV mapping, but most figures have several overlapping material zones, i.e. UV space is reused by splitting the material zones over several textures maps (typical split is head; body; eyes; fingernails, teeth, mouth; lips etc).
Open up any Poser figure in a UV mapper to see what I mean.

One useful thing is that Poser will handle UV coordinates outside the standard [0 .. 1) range, which is good for procedural shaders, or for creating multiple mappings in UV tools that don't restrict display to [0 .. 1)