Use &SYSTEM_ID to obtain the name and release of the operating system under which your source module is being assembled. &SYSTEM_ID has a global scope.
For example, on z/OS, &SYSTEM_ID might contain one of the following:
z/OS 01.04.00 z/OS 01.05.00 ... etc.
on CMS, &SYSTEM_ID might contain one of the following:
CMS 18 CMS 19 ... etc.
on z/VSE, &SYSTEM_ID might contain one of the following:
VSE/AF 6.6.0 ... etc.
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