APPL statement overview

The APPL statement defines the options to be used for an application or system. It is not essential that the options are defined on this statement, but it provides a convenient method of ensuring that specific options are used for a particular application or system.

When an application is unable to cope with parallel sessions, it cannot share a single ACB between terminals that are logged on, but requires a unique ACB for each terminal. The most common application in this category is CICS, and another example is IMS™. A convenient method of providing ACBs for such applications is to define free pools of ACBs from which an ACB may be allocated for each terminal.

In combination with the RANGE statement, a set of ACBs can be defined, one of which IBM Session Manager for z/OS can allocate when a session is established with such an application.

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