Hello Supergirl Sadly enough, Poser 4 is not "carbonized", meaning it won't work in native OS X environment. However, it will run in Classic mode (Jaguar might not keep the MacOS 9 folder into the same partition as was the case for the preceding version of Mac OSX, but it will detect if there is any OS 9 present in any of your other partitions...) So that means...partition your hard drive, clean install your version of Mac OS 9 on one partition and clean install the Mac OS X on the other (you have got to have plenty of disk space, and also, more than the required 128 Mb of ram). Install your favorite programs, and when it's done and you're ready to play, double-click on Poser 4. Classic mode will launch as soon as you double-click on the Poser program icon, and you are going to be able to go at it as you like. When I want to dabble in Poser, though, I restart with my my Mac OS 9 partition (Jaguar might be fast, but nothing compared to the performance of Mac OS 9 for any G3 G4 machine). And, added benefit given sufficient disk space, I can crank up the virtual memory (it may slow down things a bit, but gets some jobs done that otherwise couldn't) Hope it helps... PH