Certain system functions, such as retrieving a user ID or handling errors, may vary in implementation from one target system to another target system because of the combination of hardware and software being used in that target system.
Runtime user exits are standard routines that allow all generated applications to access these system features. Runtime user exits reside on the target system and can thus be accessed by each application without actually being coded as part of it. These routines can be used as they are to supply basic functionality, or they can be customized to the needs of your particular target system.
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