I've been messing around with this for days, so it's time to ask. Hillegas's first challenge is this? What puzzles me is the admonition that the window is to be of a certain type. I have googled/searched lists/ looked at the Apple Dev notes and I am sure it is there, but I am mystified **why** the challenge specifically mentions one window, and that it is **not** to be a document window. As far as I can tell, the other window is a simple application window, and this window already resides in the IB, but if someone can perhaps throw some light on this, or send a reference, I will be very appreciative.