Sharing Across Accounts
It’s all fine to say that every account is segregated from all other accounts. It’s nice to know your stuff is safe from the prying eyes of your coworkers or family.
But what about collaboration? What if you want to give some files or folders to another account holder?
You can’t just open up someone else’s Home folder and drop it in there. Yes, every account holder has a Home folder (all in the Users folder on your hard drive). But if you try to open anybody else’s Home folder, you’ll see a tiny red 
icon superimposed on almost every folder inside, telling you, “Look, but don’t touch.”
Fortunately, there are a couple of wormholes between accounts (Figure 11-10):
The Shared folder. Sitting in the Users folder is one folder that doesn’t correspond to any particular person: Shared. Everybody can freely access this folder, inserting and extracting files without restriction. It’s the common ground among all the account holders on a single Mac. It’s Central Park, the farmers’ market, and the grocery-store bulletin board.
The Public folder. In your Home folder, there’s a folder called Public. Anything you copy into it becomes available for inspection or copying (but not changing or deleting) by any other account holder, whether she logs into your Mac or signs in from across the network.
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