Using peer-to-peer software to share music, movies and other copyright-protected files across the network may violate University policy and could result in legal action.
You should log out of your laptop or workstation if you leave your work area. But if you working on something important and don't want to lose your work, just lock the screen. In Windows, use the Windows logo key +L. On the Mac, enable Hot Corners in your screen saver settings and set your computer to require a password for sleep and screensaver in Security and Privacy.