Did you follow my link? That's all you need. Set Diffuse_Value = 0, plug in Reflect. I don't care what you're planning to do with BG COLOR - it won't reflect.

Perhaps you should show me the tutorial you're following so I can disambiguate it for you. Give me a link to what you're looking at.

Please note that an enormous amount of disinformation exists about shaders. And - a lot of stuff that just doesn't apply any more because the year is 2015.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)