OS X quick-fire questions
Can I revert back to running OS X El Capitan 10.11.3?
Yes, although it is complex to say the least, and exposes your Mac to security risks. You’d need to install El Capitan from scratch, and then update it using the Combo installer for 10.11.3 before manually restoring your apps, documents, and so on, from your Time Machine backup. Some current versions of apps might not work even then.
Why can’t my iMac sleep without also sleeping its disk?
Although the Energy Saver pane offers the ability to prevent hard disks from sleeping during system sleep, this does not work in some recent models of iMac. If you don’t want your disks put to sleep, those models will also then not let the system go to sleep either.
How can I put windows into the Dock in slo-mo?
This was a favourite trick of Steve Jobs when demonstrating OS X. When you click on the amber Minimise button at the top-left corner of a window, hold ß; the window will minimise into the Dock over a period of five seconds.
Can OS X block internet tracking?
In System Preferences, the Security & Privacy pane’s Privacy tab has a Location Services item, where you can prevent apps determining your location, but to stop browser-based tracking look in your browser’s preferences. Safari has an excellent extension for this in Better (free, Mac App Store).