Spaces

In short, you can be looking at a Mac with many virtual "screens". Just because you don't see it, doesn't mean its not there!

Virtual screen is something the Linux and UNIX user world has ben accustomed to for quite some time. Now, Leopard is offering the feature with Spaces. It is possible to have more Desktops that monitors and simply switch between them by choosing the virtual screen from the icon in the menu bar.

Looking at the menu bar, if you see a square with a cross-hair and a number in the center, you are looking at the Spaces icon and the screen number! Don't forget to check all of the other screens to see what might be running. As with anything of interest, consider using Grab to take screen captures or window captures.