Back to My Mac was a remote desktop feature you could use to access your Mac’s hard drive on another device.
macOS: Using Screen Sharing Within Messages
If your friend is having problems on his Mac, you’ve gotta know that Messages has a built-in screen-sharing feature that’ll let you help from afar.
Screen Sharing Could Be a Thing in iOS 11
We don’t know how it will work yet, but have some speculation about the upcoming new feature.
