The "Domain" window opens with a gray wireframe domain and a red sphere.  The red sphere's center is determined by the white hotspot, while the sphere's radius is determined by the red hotspot.

The "Function Graph" window shows the wireframe domain colored according to the value of the function.  The red sphere is also shown in this window.

The "Range: f(x,y,z)" window shows the range of the function over the red sphere along the vertical axis.  This range is shown in magenta.