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Screen Share to your Mac over a local network

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Normally you may allow access to all users or just allow Administrators to control the Mac to see whether a user is an Administrator or not go to System Preferences > Users & Groups:

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Then in the list on the left-hand side you can see whether a user is an Administrator or not as they will have “Admin” under their username:

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To enable Screen Sharing check the box for Screen Sharing from the Sharing preference pane:

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If after checking the Users & Groups System Preference pane you are happy to allow access to all users you can leave the default settings in the Allow access box:

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If you want to limit access to just Administrators simply change the radio box to Only these users:

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By default, only Administrators will be in the access control list, to add other users or groups click the plus sign + at the bottom of the list:

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Now select the user you want to grant Screen Sharing Permissions to and then click select:

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Now we’ve added the user “mini” to the screen sharing list, you should be aware that this user may now access the current screen of your Mac so if you are logged in on your main account as the Administrator the user mini will now be able to view and control your Mac as if they were you, you must log out first if you do not want this to happen and when the user mini connects they will see the normal macOS login screen and will only be able to access accounts that they have the password for.

There is also a button on the Sharing pane called Computer Settings, this can allow you to enable the use of VNC viewers such as realVNC and TightVNC to access the Mac using just a password, if you enable this make sure you use a strong password. It can also be somewhat hit and miss using VNC from a PC rather than the Macs built in Screen Sharing.

The other option is to allow anyone to request permission to control the screen, if you enable this using another Mac and accessing screen sharing will make an alert box pop up asking you if you want to grant them permission.

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To access the screen of the Mac you have enabled Screen Sharing on look for the mac in the sidebar of the finder window, here we can see “workstation” click on workstation and then click Share Screen. If both Macs are connected to the same iCloud account no usernames and passwords will be required:

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If both Macs are not connected to the same iCloud account when you click on share screen a login dialogue box will open and you enter your User Name and password for that Mac the same as you would when logging on to the Mac when you are sat in front of it:

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This will open the Screen Sharing App which shows you the screen of the Mac you are controlling. There are a few options worth taking note of:

From the edit menu, you can enable the shared clipboard, that is if you copy something on the screen of the remote Mac you can paste it into the Mac you are using.

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And the other option worth noting is the screen quality, if the connection is a little slow and there is a lag between your actions you can set the screen quality to Adaptive from the View menu in the Screen Sharing App:

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