Why am I logged in twice on my Mac?

QUESTION: I've noticed that sometimes I appear to be logged in twice on my Mac computer, and that seems to be interfering with Java apps. How do I stop this from happening?

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How to Print Screen on Mac OSX to Clipboard

How to copy selected area of screen to clipboard

  1. While holding down Shift-Control-Command-3
  2. Hold down mouse button drag cross-hair mouse cursor to frame area of screen to be copied
  3. Release mouse button to copy to clipboard

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Mac OS X - Bookmarks

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