Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A disappointing mish-mash

Having been a fan of other books in this series (How Intranets Work, How PCs work)and recommended them as good clear simple introductions to the subject, this volume was a big disappointment. The pictures were simplistic (for example, "The Teletypewriter" consists of a map of the USA with a zig-zag red line on it), and some of the information plain misleading or wrong.The statement "The biggest disadvantage of the punched-card system was that it allowed only one program to run on the computer at one time" (page 29) is rubbish. The constraint was caused by the operating system, which had nothing to with punched cards per se.There IS a need for a text which explains this complex subject simply. Sadly, this isn't it. Not recommended.