Why is my desktop showing this on the bottom left and how do I turn it off?

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This is not part of my wallpaper, it's something Mac OS X is showing, I think it's something to do with OS X Server which is no longer installed, or something to do with remote access but I don't know.

  • I've never seen that icon before. Do you have multiple people logging into that Mac? Maybe it has to do with with user is logged in? – fsb Apr 25 '16 at 18:55
  • Only one user is logged in. I think it first appeared after I installed the Server app in Mountain Lion but I'm now on OS X 10.11 el capitan and do not have the Server app. – Warren P Apr 26 '16 at 1:12

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