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There are dozens of ways of controlling a Mac across the internet, which you might want to do to schedule a recording, start a download and so on. You could try LogMeIn, or share a desktop using Google Hangouts and Skype; you could try port forwarding the built-in VNC client in OS X, but our favourite - and the easiest - is Back to My Mac, managed through iCloud.
So long as the remote Mac is on, logged into an account tied to your iCloud login (through System Preferences) and connected to the internet, it should appear under Shared in your Finder sidebar. (If it doesn't, hover over Shared and click Show; if Shared isn't there, look in the Finder's preferences.)
Click Share Screen… to control the Mac over the internet, as if you were sitting in front of it. (It might make more sense to go Full Screen to stop yourself getting confused!) Check out the options in the menus and toolbar.
Alternatively, click Connect As… to log into the Mac to copy files from and to it. If you have a recent AirPort Extreme with a hard disk attached, or a Time Capsule, then you can access those files similarly; make sure your router is logged into iCloud using AirPort Utility.
So long as the remote Mac is on, logged into an account tied to your iCloud login (through System Preferences) and connected to the internet, it should appear under Shared in your Finder sidebar. (If it doesn't, hover over Shared and click Show; if Shared isn't there, look in the Finder's preferences.)
Click Share Screen… to control the Mac over the internet, as if you were sitting in front of it. (It might make more sense to go Full Screen to stop yourself getting confused!) Check out the options in the menus and toolbar.
Alternatively, click Connect As… to log into the Mac to copy files from and to it. If you have a recent AirPort Extreme with a hard disk attached, or a Time Capsule, then you can access those files similarly; make sure your router is logged into iCloud using AirPort Utility.