I work for a fairly large organization (about 3,000 employees) and I had a couple of questions regarding the software that tracks employee web habits.

When you log onto a network PC, a message pops up saying basically that "this PC is for work purposes only...incidental use is okay...you may be subject to periodic audits to ensure compliance with the corporate web policy". I've worked there for four years now and everytime I see that message I wonder what it means exactly. So that's why I'm here...I'm finally bored enough to ask. And by the way, today is a holiday where I work so I'm not doing this on work time

So, here are my questions...

1) Obviously they know what sites you visit during the day. What I want to know is, how can they tell how long you were on the site for? I mean I know you can track time spent on a site, but what if I go to VBForums.com and then minimize the window only to return to it 30 minutes later. Does that look like I was on the site for 30 minutes?

2) With so many staff members, how do they keep track what everyone is doing?

Basically, how does this software work?