An application uses another application if the first application is defined explicitly to use that application as an option, a startup or terminate function, or an environment. To specify that an application use another application, the application to be used must be defined at the same level or above. For example, a Group Administrator defines a group level function and chooses a system level environment; the system level environment is used by the group level function.

An application can be inherently used during application invocation. For example, if a system level environment for a system level function is copied down to the private level, the system level function, when invoked, can use the private level environment (if the private application library is active). In this case, when you request a 'Where Used List' for the private level environment, the system level function is listed.

When administering at the private level, note that if your applications are dependent on applications defined at the group level, these applications might not be invocable if you run under a different group.