The buttons on TOP are as follows:
1) X Axis  : This button, when pressed, rotates the cube about the X axis.
2) Y Axis  : This button, when pressed, rotates the cube about the Y axis.
3) Z Axis  : This button, when pressed, rotates the cube about the Z axis.
4) Viewer Rotate : When this button is pressed, the cube along with the axes
   is rotated in clockwise direction. This has the effect ofapparently rotating
   the cube & the axes in the anti-clockwise direction.
5) X : This is the 'Exit' button. When you are fed up of rotating the cube
   you use this button.

Buttons on LEFT:
1) CloseUp : Takes Viewer closer to cube.
2) Go Back : Takes the viewer away from the cube.

Also, on the RIGHT hand side of the cube you can see six buttons, namely
1) Light X+ : Moves the light along the positive X axis.
   You can see the change in the shade of the cube.
2) Light X- : Moves the light along the negetive X axis.
3) Light Y+ : Moves the light along the positive Y axis.
4) Light Y- : Moves the light along the negetive Y axis.
5) Light Z+ : Moves the light along the positive Z axis.
6) Light Z- : Moves the light along the negetive Z axis.