If the UV mapping program splits the hair down the middle, the texture, trans, or bump map will be applied the the top layer (the one we see) and the layer against the inside of the prop (againt the head). This is what makes UV mapping confusing. To get precise control over mapping I will split a prop into several groups. (using the grouping tool, or some other app) then create an OBJ for each group. Now, map the obj for each group seperately. Then import all the props back into poser and re-export all the props to one OBJ file. Last step open the all in one OBJ fiel in the UV mapper and fine tune the map. This is the technique I used to create the LSWHair and I'll bet Allie used a similar technique to create the super TransCurls Hair prop.