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macOS User Guide
- Welcome
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- Use Continuity across your devices
- Use your iPad as a second display
- Hand off between devices
- Insert photos and scans from iPhone or iPad
- Insert sketches from iPhone or iPad
- Copy and paste between devices
- Use Apple Watch to unlock your Mac and approve requests
- Make and receive phone calls on your Mac
- Control accessories in your home
- Send files between devices with AirDrop
- Use AirPods with your Mac
- Stream content to Apple TV
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- Understand passwords
- Use keychains to store passwords
- Reset your Mac login password
- Set up your Mac to be secure
- Guard your privacy
- Protect your Mac from malware
- Use Sign in with Apple for apps and websites
- Clear your Safari browsing history
- Manage cookies and other website data in Safari
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
If your Mac displays a question mark at startup
A flashing question mark at startup means your Mac is having trouble locating the system software.
If your Mac starts up after a brief delay, try reselecting your startup disk. Choose Apple menu > System Preferences, click Startup Disk, then select the startup disk.
If your Mac doesn’t start up, see the Apple Support article If a flashing question mark appears when you start your Mac.
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