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

Using files conversationally

To have your programs interact with a user conversationally, use the terminal as an input and output device for consecutive files in the program. Any stream file can be used conversationally, because conversational I/O needs no special PL/I code.

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