Protect what? Well, have you ever had your server drop you while you're writing mail in Eudora? I have. What a pain! Both my personal and my business sites are set up to continually jump to another page every 4 minutes, eliminating timeouts. Sometimes the bandwidth can be a pain, so setting the protect option 'on' will simply load this little 1.5k GIF every four minutes.
Naturally, you'll probably want to let my site scroll through my main pages, for a nice screen saver effect, but *I've* already seen them all, so I use this little gizmo. Plus it was fun. What, I need another reason?