But is it possible to run OS 9 anymore in an OS X window? Or is that kaput?
Hmmmmmm. . . good question. I think I saw him running OS X.5 in a VM on that OS X.11 El Capitan. OS X.5 can still run Rosetta, the virtual machine that will run MacOS 9.2.2 in an OS X Window, so I think the answer would be yes, it can!
It is possible, but not easy. VMWare works like it does because all of the OSes run on Intel hardware; to run OS 9, you need to emulate PowerPC hardware. SheepShaver is the most popular open-source PPC emulator.