If you card only supports 4 textures, I wouldn't bother with shader etc as the card already must be extremly old or extremely underpowered so it would break anyway if you try to do such "hardcore" stuff especially as most shader stuff done today needs Shader 2 / 3 which is definitely nothing adviceable for your card (thought the last one that only supported that less was GeForce3? Perhaps SiS, Intel and the like but those are no 3D cards anyway, just 2D with minimal 3D support for WinXP / Vista)
Max Texture Units
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