If you wanted to mess someone’s Mac up, you could go into their system files and change things around when they were out at lunch.
Mac OS 9
Already, it is being rumoured that this summer, Apple will change the name of OS X to macOS. Is this just for consistency?
I would like new windows in apps to open in the lower half of the screen. Can El Capitan do that yet?
Old archived files had lost association with the right app. What went wrong?
Among the new features of 9.1 was support for the burning of CDs in the Finder, and Finder support for switching between open windows.
In comparison with OS X, Mac OS 8 and 9 were tiny and simple. Installing or replacing a component was a minor task; here is how we did it.
With Mac OS 8 and 9 back in 2001, we had to performance routine maintenance to keep the Desktop working. This is how we did it.
Step-by-step instructions for setting up a dial-up Internet connection under Mac OS 8 or 9.
The Eclectic Light Company 