Security for unattended computers is a hot issue at work...and I want to believe it's the same in almost all organizations. Just imagine if somebody gets to use my computers if I leave unattended. I will be liable to whatever data stored there, plus god know what that person can do to my network access.
At work, leaving a computer unattended is against company policy depending on its impact, it can cause an employee his/ her job. But the as human as we are, in our hurry to go somewhere, sometimes this happens. And companies acknowledge this...so that more than trying to police its employees who forgot to logoff or lock their computers, they have become more proactive and implement software that can auto logoff an idle computer. This software is a screen locking system for Windows®. It extends the capability of the standard workstation lock and gives network administrators complete control over idle workstations.
You may want to visit the site to know more.