Computers Software

What is a good book or internet guide on how different computers and software actually work?

Hi there, I am looking for a good, clear, plain English book or internet guide that explains how computer and software have developed over time and how they actually work. For example, in a typical transaction processing system for customer orders, what is the hardware and how is the software structured into programs and data files? When looking at such a system, how can you tell what it is and how it works – ie Mainframe or Client Server and such like? For example, if you wanted to extract transaction data how would you find the data file?
So I am looking for something that is going to give me at least a starting point on these questions.

Here are some free links

Transaction Processing System

http://en.wikipedia.org/wiki/Transaction_Processing_System

Mainframe Computer

http://en.wikipedia.org/wiki/Mainframe_Computer

Client Server

http://en.wikipedia.org/wiki/Client_server

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