Oh man, this brings back memories! I have a physical copy of this book, which I read cover-to-cover, years ago. I even worked at Be for awhile, until they wen

Oh man, this brings back memories! I have a physical copy of this book, which I read cover-to-cover, years ago. I even worked at Be for awhile, until they went out of business. Dominic Giampaolo was long gone by then, of course. The Be file system maintained state that was a lot like database indexes, which could be created by user-level programs. I made specific use of this feature in my first big program for BeOS. When I eventually ported it to MacOSX, I had a lot of additional work to do, because the Mac file system doesn't have anything like that.