Most of the cube faces are solid in color, although one demonstrates OpenGL's ability to smoothly blend colors across a polygon. With the window activated, several keys are active to control the display and the cube's motion. The arrow keys will change the spin rate on two axis. Pressing R will reverse the cube's rotation, and hitting S or the space bar will stop the cube's movement. For example, pressing T will activate the rendering of textures.
Some options only make sense in combinations with others.
For example, turning on F iltering does nothing if texturing isn't also on. Nor will turning on A lpha-additive mode make any visible change unless B lending is also active. L ighting can be turned on or off at any time, and it demonstrates why surface normals need to be defined correctly. It is worth spending some time trying the different combinations of rendering options and texture modes and seeing how they all interact. In particular, try all the texture modes with only texturing turned on and then again with texturing and blending.