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OpenGL OpenGL and Matrices

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Hey, so, I read on this page: (question 9.005) ...that the OpenGL matrices are stored as a single run of 16 floats, and so it doesn't matter whether they're considered row-major or column-major or not. But it must matter where multiplication is concerned, right? I mean, do I pre-multiply or post-multiply? In most of the shader code I see, the order of multiplication is opposite from what I see in HLSL code. I guess this is a math question more than an OpenGL question. This FAQ just confused me a bit, is all.

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