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{{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==
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