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macOS User Guide
- Welcome
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- Change System Preferences
- Change your desktop picture
- Add your email and other accounts
- Use a screen saver
- Change the picture for you or others in apps
- Set up other users on your Mac
- Set up Screen Time for yourself
- Change the system language
- Make it easier to see what’s on the screen
- Use accessibility features
- Run Windows on your Mac
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- Use Continuity across your devices
- Stream audio and video with AirPlay
- Use your iPad as a second display
- Hand off between devices
- Insert photos and documents from iPhone or iPad
- Insert sketches from iPhone or iPad
- Copy and paste between devices
- Use Apple Watch to unlock your Mac
- Make and receive phone calls on your Mac
- Control accessories in your home
- Send files between devices with AirDrop
- Use AirPods with your Mac
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- Manage cookies and other website data in Safari
- Use Private Browsing in Safari
- View privacy reports in Safari
- Understand passwords
- Reset your Mac login password
- Use keychains to store passwords
- Set up your Mac to be secure
- Guard your privacy
- Use Sign in with Apple for apps and websites
- Protect your Mac from malware
- Control access to your camera
- Find a missing device
- Resources for your Mac
- Resources for your Apple devices
- Copyright
If another system tries to connect to an app on Mac
When another computer tries to connect to an app on your Mac over the network or Internet, macOS displays an alert message. The app may be trying to allow other computers to connect with your Mac, or it may be sharing information with other computers.
Note: If no action is taken, the message remains displayed and any attempts to connect to the app are denied.
On your Mac, do one of the following:
If this type of behaviour is expected from this app, click Allow.
If you don’t expect the app to connect across the network, or if you don’t want to share information, click Deny. This blocks attempts by other systems to connect to the app.
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