Which question is that, exactly?
Well, yes, you are missing something. The 9500 cannot boot OS X without assistance. So if you just put the OS X install CD (assuming it's not for Rhapsody or OS X Server 1.x), you can't boot from it. However, if you download XPostFacto, the XPF app places a few files on your hard drive that allow you to bypass the requirement for a G3 on most Macs. You can then boot OS X 10.0.x, 10.1.y, and 10.2.z on your 9500. But XPF is a requirement. For that matter, it is also a requirement for any flavor of OS X on anything prior to a genuine G3 even if you have upgraded to a G3 or G4 processor.
Peace,
Drew