I ran Ray Dream and C1 on an old Performa 6400 and it was a nightmare compared to running it on a G3. Personally I would say you need a G4, 800 MHz and 1 GB RAM to use C2 fully. Search this forum on how to import Poser characters with textures/transmaps, because there are a dozen articles on it. Some PC users refer to Grouper (just one of a long list of 3D apps with no Mac version), but you don't really need Grouper if you are careful.