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

MDECK

This option specifies that the macro facility output source is written with the file extension of .DEK and the file is put in the current directory.

Read syntax diagramSkip visual syntax diagram   .-NOMDECK-.
>>-+-MDECK---+-------------------------------------------------><
 

ABBREVIATIONS: NMD, MD

MDECK is ignored if NOMACRO is in effect. See MACRO for an example.

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