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When you are finished using a computer in the lab, don't forget to logout. If you do not logout, the next person who uses that computer will have access to all of your personal files - including your email. The next user will also be able to print using your allocation of pages.
Windows 7: Click on the Windows Start Button (circle in the lower left); click on "Log off".
Windows 8.1: Click on the Windows Start Button (squares in the lower left); click on your name, select "sign out"
Macintosh OS X: Click on the Apple menu; select Log Out.
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