Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

Writing your own compiler exit

To write your own user exit, you can use IBMUEXIT (provided as one of the sample programs with the product) as a model. As you write the exit, make sure it covers the areas of initialization, message filtering, and termination.

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide