An application that supports scripting or macro languages, such as an editor, can use REXX as the macro language. An application that is written in a programming language such as C can create a z/OS UNIX REXX environment and run a REXX program directly. For information on using the TSO/E REXX programming services, such as IRXJCL and IRXEXEC, see z/OS TSO/E REXX Reference.