Mr. Lee's book is a good refresher for those who are looking to brush up on their serial interface communications .NET programming skills. When I think of networking, the things that come to mind are sockets, servers and clients or, in other words, communicating between multiple systems through the Ethernet, but this book goes beyond this. I would like to have seen more depth the areas of sockets (Chapter 1) and serial communication (Chapter 2). Instead, we see more of an introduction to these and many more serial-based interfaces, such as RFID, Bluetooth, GPS, infrared and fingerprint recognition. Still the book is very informative and well worth reading. For the hobbyists among us, the author offers a number of low cost methods to investigate each interface method. Thank you Mr. Lee and I look forward to your advanced user edition.