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Broadly speaking, there are two types of computer programmers. Systems programmers write the instructions, called programs or software, that control the entire computer system, including both the central processing unit and the equipment with which it communicates, such as terminals, printers, and disk drives. Application software is the software that is most familiar to computer users. Applications programmers write the software that is used to create word-processing, spreadsheets, and e-mail packages, commonly used in business; games, accounting, and reference software used by the average consumer; Web browsing applications; and subject- or skill-based software used in schools.
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