A QuickTime Movie puts you in the center of a site. You can view 360 degrees around as though you are turning either left or right to see all that's surrounding you. You can zoom in for a closer view, or zoom out for the larger picture. You can move up or down to a degree.
Your QuickTime Movie displays in a new, smaller window on your screen. After your movie loads, you'll see part of the site (usually a view to the North). Now you click and hold down your left mouse button and drag the picture right (or left).
So you see around the site as though you were there looking as you turn.