RAD Studio VCL Reference
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Graphics.clSystemColor Constant

Is a mask used to identify the set of system colors.

Pascal
clSystemColor = $FF000000;
C++
clSystemColor = 0xFF000000;

clSystemColor has the 1st byte bits set on as ameans of identifying a system color.  

For example, clActiveBorder is system color, used as the default color to paint the active border of a component - it has the high order byte set to $FF. clRed is not a system color, since the high order byte is 0. 

 

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