Assign an Apple ID to a Mac User Account in Mac OS X for Added Peace of Mind
Some Mac users overlook a feature in macOS / Mac OS X that allows them to attach an Apple ID to their actual user account, not just to iCloud and the App Store. It only takes a moment to set, and it provides for an incredibly simple password recovery option at the login and boot menus, allowing you to regain access to your user account and files just by entering the associated Apple ID.
Going further, Macs with multiple user accounts can assign different Apple ID’s to each unique user account, or you can just choose to tie a single Apple ID to the Mac. If you do choose to attach a lone Apple ID to the Mac this way, be sure to associate it with an administrator (admin) account in Mac OS X, that way you will be able to regain full system access in the event it’s needed because the primary password has been lost.
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Ever needed to quickly mirror a Mac display, switching another screen from an extended desktop to the mirrored image of what’s on the primary screen? Sure, you can visit the System Preference Display panel and fumble around in settings, but there is a much easier and faster way to toggle display mirroring with just a simple keyboard shortcut.
iOS devices can use an optional 

The iPhone is easily one of the best pieces of technology ever invented, but let’s just go ahead and admit that nothing is perfect. There are a few default settings on the iPhone that are just plain annoying, but within just a minute or two you can fix all of that with a handful of simple adjustments, and have a much better experience.