It's certainly well-known that you can setup file sharing very easily in the Sharing panel in System Preferences. But you don't have to open System Preferences to share files. In fact, you can share files with anyone, even without creating an account for that person beforehand. In the Finder, select whatever folder or file you'd like to share and choose Get Info from the File menu (or right- or control-click and select Get Info). Expand the Sharing & Permissions section if it's not expanded already at the bottom of the window. A lock icon should appear in the lower-right corner of the Get Info window; click it to authenticate. After you enter an administrator username and password, click the plus (+) symbol to display a user-selection dialog. Besides seeing users already created on your Mac, you'll also see the Address Book along with any groups you've created. In addition, ...

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