S
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server
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The computer on which OpenGL commands are executed. This might differ from the computer from which commands are issued. See also client. 
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shading
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The process of interpolating color within the interior of a polygon, or between the vertices of a line, during rasterization.
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single-buffering
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An OpenGL context without a back color buffer.
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stipple
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A one- or two-dimensional binary pattern that defeats the generation of fragments where its value is zero. Line stipples are one-dimensional and are applied relative to the start of a line. Polygon stipples are two-dimensional and are applied with a fixed orientation to the window.