I haven't yet, but I was considering the Registry method for configuration and loading specific settings. Wordware's book on design patterns is my next book; I've been reading about OOA&D this past week or two, and letting that sink in first.

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Programmers are in a race with the Universe to create bigger and better idiot-proof programs, while the Universe is trying to create bigger and better idiots. So far the Universe is winning. - Rich Cook