Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. On many computing platforms everything is a file. On the AS/400 everything is an object. AS/400 objects share similarities with objects in object-oriented programming, but there are differences as well. There are similarities in that when storage is allocated for something, that something is of a specific type, and only a specific set of programs are allowed to act upon that object. There are differences in that even though the AS/400 supports Java and C++, AS/400 objects cannot be inherited like the classes in those languages. Another difference is that the set of object types in OS/400 (the AS/400's operating system) is fixed by IBM, and only IBM has the ability to create new ones.

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