WPCLSLST (Workplace Class List) creates a workplace object class and an instance of a workplace object class. Workplace objects are constructed using the SOM protocol and are instances of one of the following workplace object classes:

Predefined

These classes are defined by the system. Examples of predefined workplace object classes are WPObject, WPFileSystem, and WPAbstract.
Subclass
These classes are derived from existing predefined workplace object classes. They add or remove function; however, they retain the basic behavior of that class.
Replaced
These classes replace the class being subclassed. They notify the behavior of an instance of a predefined workplace object class without the instance being aware of the new class.

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