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macOS User Guide
- Work across devices using Continuity
- Use iPhone as a webcam
- Use iPhone with Desk View
- Stream audio and video with AirPlay
- Use one keyboard and mouse to control Mac and iPad
- Hand off between devices
- Unlock your Mac with Apple Watch
- Make and receive phone calls on your Mac
- Sync music, books and more between devices
- What is Family Sharing?
- Set up Family Sharing
- Add a user or group
- Set up Screen Time for a child
- Share purchases with your family
- Watch and listen together with SharePlay
- Share a Photo Library
- Collaborate on projects
- Find content shared with you
- Find your family and friends
- Play games with your friends
- Resources for your Mac
- Resources for your Apple devices
What is a firmware password on Mac?
A firmware password prevents users who don’t have the password from starting up from any internal or external storage device other than the startup disk you’ve selected. It also blocks the ability to use most startup key combinations.
To create a firmware password, start up your Mac from macOS Recovery by pressing and holding the Command and R keys immediately after turning on your Mac. When the Recovery window appears, choose Utilities > Firmware Password Utility (OS X Mountain Lion to macOS Sierra) or Utilities > Startup Security Utility (macOS High Sierra or later). These utilities are available only on Mac models that support use of a firmware password. To learn more, see the Apple Support article Set a firmware password on your Mac.
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