On Thu, 5 Oct 2023 20:54:56 +0000, Seymour J Metz <[email protected]> wrote:

>Even if you have an OMVS segment, you don't get dubbed ntil you use a Unix 
>service.

Environment variables are not unique to UNIX and do not require dubbing. It is 
a feature of the C/C++ language that is in the STDLIB (standard library) and 
can be used in any environment. 

Environment variables are only useful in languages that do not support global 
variables or inter-language global variables is not supported. I suspect that C 
and Cobol global variables are shared because of LE. Languages like shells, 
Python, Java and others which are runtime languages don't have access to C and 
Cobol global variables which makes environment variables a simple 
inter-language-communications feature.

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