OS X Mountain Lion: Share the screen of another computer
If you’ve been given permission, you can view and control the screen of another computer on your network. To turn on screen sharing and specify who can share the screen, use the Sharing pane of System Preferences on the computer whose screen you want to share.
- Open a Finder window. If no shared computers appear in the Shared section of the sidebar, put the pointer on the word “Shared” and click Show.
- Select the computer whose screen you want to share, and then click Share Screen.
- Select how you want to connect to the computer:
Option Description As a registered user: Select this to connect to the other computer using a valid login name and password. If “Only these users” is selected on the other computer, make sure the login name you’re using is on the list of allowed users. By asking permission: Select this if you want to ask the current user of the other computer for permission to share their screen.
- If someone else is already connected to the Mac as a remote user, a dialog asks if you want to share the display with the other remote user (“Share the display”), or set up your own screen (“Connect to a virtual display”). Choose the option you want.
If you choose “Connect to a virtual display,” you will share the Mac with the other remote user, but you won’t share the same screen.
If you know the IP address or the DNS name of the computer you want to share, you can also connect to it by choosing Go > “Connect to Server” in the Finder, and then entering vnc://[IPAddress] or vnc://[Name.Domain] in the Server Address field. To find the address or local name of the computer, open Sharing preferences and select Screen Sharing. The address or name is displayed in the window to the right.