On El Capitan's login screen the status menu (top right near time) shows an icon of two overlapping squares, one square is to the top left and looks behind the other. It doesn't show once I login. What does this icon represe
Does the icon look like what is in this image?
http://cdn.osxdaily.com/wp-content/uploads/2014/11/screen-sharing-messages-app-mac-os-x.jpg
If so it sounds like it would be related to Screen Sharing.
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That I'm not as sure about. Is Screen Sharing enabled in System Preferences Sharing? – mcmar Dec 9 '15 at 4:02
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