Lock your workstation!

• Use screen savers that activate within a maximum of 15 minutes of no keyboard or mouse activity.
• Use the (CTRL+ALT+DELETE [Enter]) or (Windows key + L for windows XP) locking function to lock your workstation immediately. It's very easy to get pulled into impromptu meetings and auto-locking helps mitigate the risk of an unattended workstation.
• There's no simpler way of accessing someone's account than by just using their unsecured workstation. Lock it when you leave it.