I don't agree with you on that. (I am not the person who downvoted you, however.)
Both z/OS and Windows NT use the word "subsystem" to refer to OS components, but the commonality is purely at the terminological and most abstract conceptual level, I don't see any commonality at the level of technical details, and I see no evidence of any concrete technical influence from z/OS on Windows NT.
"Subsystem" is a highly generic term used to refer to an OS subcomponent across many operating systems – z/OS, OS/400, OpenVMS, Windows, Linux, among others. The meaning of the term varies widely, and what counts as a subsystem isn't always precisely defined. In z/OS, "subsystem" is a quite precisely defined term – it is something which is installed by calling the "IEFSSI REQUEST=ADD" macro, and which then is displayed in the output of the "DISPLAY SSI" console command. By contrast, in Windows NT, the term "subsystem" is never clearly defined – for example, is Client/Server Run-Time Subsystem (CSRSS) a subsystem or part of the Win32 subsystem (a subsystem of a subsystem)? Is the Session Manager Subsystem an integral subsystem or a part of the integral subsystem? I'm not sure there is a clear answer to these questions, whereas the question of what counts as a subsystem on z/OS is quite clear – is it visible in the "DISPLAY SSI" output?
(Slightly complicating the issue is that z/OS has both subsystems and functional subsystems, which are different things despite the similar name – subsystems implement the Subsystem Interface (SSI), functional subsystems implement the Functional Subsystem Interface (FSI).)
Both z/OS and Windows NT use the word "subsystem" to refer to OS components, but the commonality is purely at the terminological and most abstract conceptual level, I don't see any commonality at the level of technical details, and I see no evidence of any concrete technical influence from z/OS on Windows NT.
"Subsystem" is a highly generic term used to refer to an OS subcomponent across many operating systems – z/OS, OS/400, OpenVMS, Windows, Linux, among others. The meaning of the term varies widely, and what counts as a subsystem isn't always precisely defined. In z/OS, "subsystem" is a quite precisely defined term – it is something which is installed by calling the "IEFSSI REQUEST=ADD" macro, and which then is displayed in the output of the "DISPLAY SSI" console command. By contrast, in Windows NT, the term "subsystem" is never clearly defined – for example, is Client/Server Run-Time Subsystem (CSRSS) a subsystem or part of the Win32 subsystem (a subsystem of a subsystem)? Is the Session Manager Subsystem an integral subsystem or a part of the integral subsystem? I'm not sure there is a clear answer to these questions, whereas the question of what counts as a subsystem on z/OS is quite clear – is it visible in the "DISPLAY SSI" output?
(Slightly complicating the issue is that z/OS has both subsystems and functional subsystems, which are different things despite the similar name – subsystems implement the Subsystem Interface (SSI), functional subsystems implement the Functional Subsystem Interface (FSI).)