Optional functionality is provided in one of the following ways:
Note: No functionality is provided through optional APARs. If a PTF introduces new functionality, it is a required PTF. This functionality is controlled via one of these three methods. Any options previously provided via an optional APAR were converted to one of these three methods. For a list of optional APARs which were replaced, see the Release Notes for Version 18.0.00.
Optional functionality applied through any of these methods can be easily added or removed and can be preserved across maintenance updates.