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{{Short description|IBM operating system}}
'''Group Control System''' ('''GCS''') is an [[operating system]] made by [[IBM]], meant to run as a guest of [[VM (operating system)|VM]]. GCS is an integral component of the discontinued [[VM/SP]] (since VM/SP 4), VM/XA SP, [[VM/ESA]] and current [[z/VM]] IBM System product offerings.▼
{{More citations needed|date=November 2024}}
{{Infobox OS
| name = Group Control System (GCS)<!-- Name of program or distribution -->
| logo = <!-- filename only (no wikilink, no Image:/File:) -->
| logo caption =
| logo size =
| logo alt =
| screenshot = <!-- filename only (no wikilink, no Image:/File:) -->
| caption =
| screenshot_size =
| screenshot_alt =
| collapsible =
| version of = <!-- For articles about releases of operating systems ONLY -->
| developer = [[IBM]]<!-- Name of main developer or sponsor-->
| family = <!-- "Unix-like" or "Microsoft Windows" -->
| working state = <!-- "Current", "Discontinued" (operating systems), or "No longer supported" (releases) -->
| source model = <!-- "Open source", "Closed source", or "Shared source" -->
| released =
| discontinued = <!-- DON'T use this for articles about releases of operating systems -->
| RTM date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
| GA date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} ONLY for articles about OS releases -->
| latest release version =
| latest release date =
| latest preview version =
| latest preview date = <!-- {{Start date and age|YYYY|MM|DD|df=yes/no}} -->
| marketing target = [[IBM mainframes|IBM mainframe computers]]
| programmed in =
| language = <!-- Supported human languages (English, French, Italian, Arabic, ...) -->
| update model = <!-- APT, Windows Update, etc. -->
| package manager = <!-- dpkg, rpm, Windows installer, etc. -->
| supported platforms = <!-- IA-32, x64, Itanium, ARM, etc. -->
| kernel type = <!-- Hybrid, Monolithic, Microkernel, Exokernel, Nanokernel, etc. -->
| userland =
| ui =
| license = [[Proprietary software|Proprietary]]
| preceded by =
| succeeded by =
| website = <!-- {{URL|www.example.org}} -->
| support status = <!-- For articles about releases of operating systems ONLY -->
| other articles =
| prog_language =
}}
{{History of IBM mainframe operating systems}}
▲'''Group Control System''' ('''GCS''') is an [[operating system]] made by [[IBM]], meant to run as a guest of [[VM (operating system)|VM]].<ref>{{Cite web |title=What GCS Is | website=[[IBM]] |url=https://www.ibm.com/docs/en/zvm/7.2?topic=overview-what-gcs-is}}</ref> GCS is an integral component of the discontinued [[VM/SP]] (since VM/SP 4), VM/XA SP, [[VM/ESA]] and current [[z/VM]] IBM System product offerings.
==Overview==
GCS's purpose is to provide an environment to run some specific [[MVS|OS/MVS]]-based applications and networking [[middleware]] under VM. To this end, GCS provides a limited simulation of the OS/MVS APIs. While [[Conversational Monitor System|CMS]], the usual VM guest, already has OS simulation, it is not extensive enough to run some applications such as [[VTAM]].
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To implement this, GCS uses several techniques:
* A
* [[IUCV]] communications between virtual machines
* A recovery virtual machine, designed to
GCS is not designed to be a multi-purpose user operating system such as CMS. For example, it does not allow for file editing.
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* [[NETVIEW]] : A networking monitoring service
==
{{reflist}}
* [http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSF5B20/CCONTENTS?SHELF=EZ2ZVM01&DN=SC24-6098-02&DT=20070419173550 z/VM 5.3 Group Control System]▼
== External links ==
{{DEFAULTSORT:Group Control System(Vm)}}▼
▲* [https://archive.today/20121210084740/http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/HCSF5B20/CCONTENTS?SHELF=EZ2ZVM01&DN=SC24-6098-02&DT=20070419173550 z/VM 5.3 Group Control System]
[[Category:IBM Mainframe computer operating systems]]▼
{{IBM operating systems}}
▲{{DEFAULTSORT:Group Control System(Vm)}}
[[Category:VM (operating system)]]
{{operating-system-stub}}
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