What is the `bmiColors` member in the `BITMAPINFO` structure?

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typedef struct tagBITMAPINFO {
  BITMAPINFOHEADER bmiHeader;
  RGBQUAD          bmiColors[1];
} BITMAPINFO, *PBITMAPINFO;

I never really understood what the values in the bmiColors array do. I usually 0-fill it, but putting in any arbitrary value doesn't affect my application at all.

The MSDN documentation is also ambiguous on what that member does, when I simply manipulate the pixels in the COLORREF array allocated by CreateDIBSection, and then bitblt.

What is bmiColors?

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