REXX variables available to macros

IDF provides the EXTRACT command so that an IDF macro can obtain information about IDF, IDF Language Support, or the target program and the environment in which it is executing.

The EXTRACT command returns data in:

one or more fixed variables, or fixed stemmed arrays
a stemmed array controlled by the STEM command

A REXX stemmed array will consist of "stem.n", where stem.0 contains the number of items in the stemmed variable array, and the remaining items contain the requested information.