Poser usually exports objects with a "mtl" file. Your other program (Bryce, Lightwave) would have to be able to read in the mtl file to know how to apply textures and colors to the materials. Programs like Vue and Cinema 4D can read Poser pz3 files that have the materials built into the file. But, currently, no other program can read Poser 5 materials and dynamic cloth information.