Whether working at a computer specifically assigned to you or one available for public access (in a computer lab or shared housing), make sure you log off before you walk away and leave it unattended. You can also lock a workstation without completely logging off if you only plan to step away for a quick second.
Forgetting to log off or lock a workstation not only puts your personal data and reputation at risk, but it can also pose a risk to the entire network.
For more about keeping your computer, accounts, or data safe, see:
http://kb.iu.edu/data/akln.html
For directions on how to lock your workstation, see:
Windows: http://kb.iu.edu/data/acdt.htmlMacintosh: http://kb.iu.edu/data/ajqx.html