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Color Hex Sections

I've been playing around with LabVIEW colors for a little bit and noticed that they seem to use 4 Hex sections for Colors, with a max value of 0xFF FF FF FF.  Of course the last 3 sections are for RGB respectively, and it seems like a value of 0x01 00 00 00 is the transparent color, but any other value that uses the first section is just black.  Why is that?  I find it hard to believe they would make it able to have a max value of 0xFF FF FF FF if they were only going to support numbers up to 0x01 00 00 00.  Or was it just that it was simpler to include those extra numbers to make it a full Hex number?  Just curious if anyone knows any other interesting behaviors with the codes > 0x01 00 00 00.  Thanks!

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I think those are reserved for system colors (e.g. title bar color, etc.)

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