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At one time the readers of this book might well have been specialists, but that is no longer the case, and this book must be suitable for a wider audience. Naturally, all of the new technologies are included here, but there is one thing that is not new, and that is the approach that this book has always taken, which is to approach complex subjects a step at a time from straightforward beginnings. To suit a wide range of readers, some of the more complex subjects have been separated out into essays, and some of the key topics have been highlighted.