Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Programming Guide

Attempting to use files not associated with data sets

If you attempt to use a file that has not been associated with a data set, (either through the use of the TITLE option of the OPEN statement or by establishing a DD_DDNAME environment variable), the UNDEFINEDFILE condition is raised. The only exceptions are the files SYSIN and SYSPRINT; these default to stdin and stdout, respectively.


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