MSDN documentation

[OneEyeMan]

Hi, ALL,
First a rhetorical question:

Why MS declared a COLOR variable as BYTE in here for bUnderlineColor?

Now on the more serious note:

Are the values for this BYTE variable documented somewhere?
I found this, but my preference is to have an official source.

In addition - this variable is documented for rich edit version 0x0800.
But when I start MS Word 2010 here in my Windows 7, type something, then do "Right click -> Font...", then select the underline type and color, it will use this color without any issues.
Does this mean it just not available to public as of yet and implemented internally inside MS Office/Word?

Is there a way to do that?
Thank you in advance!