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If you have two different BSDFs (xml files) for two different panes of glass, as you have described here (i.e. an upper daylight window and a lower view window), then you would simply model the two different windows explicitly and assign the BSDFs accordingly. Each window would be a separate simulation.

The glows for the window, sky and "ground" are all 1 in a daylight coefficient simulation. If you model the sky/ground envelope as a sphere, Radiance will automatically apply a ground reflectance factor to the radiance if the ray intersects below the horizon (default is 0.20).