What is the difference between statements A and B?

A: gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex;

B: gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;

Is the following code valid?

Which function should be used to specify the value of a sampler1D?

What should be the render mode to use glLoadName ()?

What is usually the best texture format for upload?

Which primitives may be used to draw a circle?

Once a 2D or 3D rotation is performed, is it possible to reverse the rotation?

What is a VBO?

Opengl uses a 3D Cartesian Coordinate System.

What are "texture coordinates" used for?

Is ambient light possible in OpenGL?