OSX Jaguar allows you to essentially backtrack to your previous work and programs that were created in OS9 by rebooting the system into OS9 classic.
HOWEVER, if you have not already installed the upgrade from
8.6 to a version of OS9 (preferably 9.2) IT WILL NOT WORK!
YOU MUST HAVE ALREADY UPGRADED TO OS9.

If you reboot to 8.6 from OSX you must re-install the entire
OSX operation system .
OS 8.6 does not recognise OSX.