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You already know my overall opinion of Windows 8: that it’s two very good operating systems — one for touch screens, one for mouse and keyboard — idiotically superimposed on each other. You wind up with duplicate everything: two Web browsers, two help systems, two search features, two control panels (actually three, but never mind). It’s very confusing. But for the last few weeks, I’ve been up to my neck in writing a how-to book on Windows 8, and that means mucking around in its deepest, darkest corners. That means learning its idiosyncrasies and quirks. That means getting to know its most embarrassing lapses and its most unsung brilliance.