A library on the AS/400 is an object that is used as a system directory to keep track of other objects.The other directories that can be used are the directory.AS/400 objects are not actually stored in libraries. They're really nothing more than namespaces, but it's easier to refer to an object as being "in" or "stored in" a library.Certain types of the AS/400 object can be compiled, copied, and stored into/from many different libraries concurrently, with the Library List hierarchy determining which instance of the object to use during execution of any application that utilizes that object name. There are AS/400 commands to help move objects around, and objects may be qualified at compile time to point to specific other objects statically at runtime, in order to circumvent the Library List.Other types of objects, designated as "system" objects cannot be replicated. Libraries are a "system" object, and therefore only one instance of any given Library "name" is possible. They're made to appear as if they're stored in the QSYS library. Other "system" objects include user profiles, configuration objects, etc.

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