You can use the MVSVAR, SETLANG, STORAGE and SYSCPUS external functions in REXX execs that run in any address space, TSO/E and non-TSO/E. You can use the other external functions only in REXX execs that run in the TSO/E address space.

The following topics describe the TSO/E external functions. For general information about the syntax of function calls, see Syntax.

In this section, examples are provided that show how to use the TSO/E external functions. The examples may include data set names. When an example includes a data set name that is enclosed in single quotation marks, the prefix is added to the data set name. In the examples, the user ID is the prefix.

Guideline: If you customize REXX processing and use the initialization routine IRXINIT, you can initialize a language processor environment that is not integrated into TSO/E (see Types of environments - integrated and not integrated into TSO/E). You can use the SETLANG and STORAGE external functions in any type of language processor environment. You can use the other TSO/E external functions only if the environment is integrated into TSO/E. TSO/E REXX customizing services describes customization and language processor environments in more detail.