Drawing Lines over Polygons

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Basics Of Polygon Offset 
What are the basics for using polygon offset?
Parameters of Polygon Offset 
What are the two parameters in a glPolygonOffset() call and what do they mean?
Different Specification Of Polygon Offset 
What's the difference between the OpenGL 1.0 polygon offset extension and OpenGL 1.1 (and later) polygon offset interfaces?
Polygon Offset and Point and Lines 
Why doesn't polygon offset work when I draw line primitives over filled primitives?
Drawing Coplanar Primitives Widthout Polygon Offset 
What other options do I have for drawing coplanar primitives when I don't want to use polygon offset?