SMP/E uses two sets of libraries:
When a product is installed by SMP/E, the target and distribution libraries are populated. The target libraries are populated during the SMP/E APPLY process and the distribution libraries are populated during the SMP/E ACCEPT process. At this point, the target and distribution libraries contain identical versions of the product modules.
Maintenance through SMP/E is applied to the runtime system (the target libraries) first. After the maintenance has been running on the system for a period of time or when it appears that there are no problems with the maintenance, it is applied to the backup libraries (the distribution libraries).
When maintenance is installed on the running libraries, it is said to be applied. When installed on the backup libraries, it is said to be accepted.
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