▶ 2.2 Programs and Processes
To make the most out of our computers, we run as many programs simultaneously as possible. When drafting a report or paper, people often run a word processor in one window and a web browser in the other. We rely on the operating system (OS) to run the processes for us and to make sure that our keystrokes and mouse clicks go to the correct program. Most systems fall into two categories: Windows-based systems and Unix-based systems. The Windows-based systems were developed by Microsoft. Unix-based systems include the many variants of Linux, Sun’s Solaris operating system, Google’s Android, IBM’s AIX, and both Apple’s iOS and MacOS (formerly called OS X).
Originally, people operated computers by typing individual ...
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