Hi, from my understanding Poser 5 for Mac will support multiprocessing since it'll run under OSX. This is a operating system thing. As far as I know all applications that run under OSX use the second processor. Just my two cents. :) If I'm wrong please correct me. If anyone from CL is reading this thread: Could you guys give a statement about this question? While reading the first post from operaguy I think this was a PC related question, so there's quite a big difference between PeeCeeOS like Win2K and MacOSX. Phil