SETCOLORRGB

I am working through some examples in the book "Compaq Visual Fortran A Guide to Creating Windows Applications' in which this code is given:

    ibackcolor=rgb(255,255,255)     ! white
    ifrontcolor=rgb(0,0,0)          ! black
     iret = setcolorrgb(ifrontcolor)
     iret = setbkcolorrgb(ibackcolor)
     iret = settextcolorrgb(ifrontcolor)

This is equivalent to the following given in the Intel documentation:

     iret = setcolorrgb(Z'00000000')
     iret = setbkcolorrgb(Z'00FFFFFF')
     iret = settextcolorrgb(Z'00000000')

My question is where in the Intel documentation do I find a description of the RGB function?   Where can I find documentation for other functions like RGB that are built into Intel Visual Fortran? 

Thank you.