So what exactly is the point you are trying to make?

Concept 2.1: Points and Lines in OpenGL
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Points
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A point is represented by a set of floating 
point numbers called a vertex.   

Lines
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In OpenGL, the term line refers to a line segment,
not the mathematician's version that extends to 
infinity in both directions.  Lines are specified 
in terms of the vertices at their endpoints.

Note:
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We shall examine more about points and lines in 
Concept3.3 - Drawing Primitives.