From David Bolton,
Your Guide to C / C++ / C#.
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Definition: Modern Operating Systems like Linux or Windows have some special code at the heart of the system.

This code has access to most of the available resources of the computer system and has been written to respond to events very rapidly. It must also provide an API (Application Programming Interface) so that user written programs can make use of the system resources in a controlled and safe way.

Glossary:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Also Known As: Executive