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{{orphan|date=December 2009}}
'''Group Control System''' ('''GCS]]])
Its purpose is to provide an environment to run some specific [[MVS|OS/MVS]]
▲GCS - [[VM (operating system)|VM]] Group Control System is a VM guest operating system and 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.
▲Its 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]] already has OS simulation, it is not extensive enough to run some applications such as [[VTAM]] and VTAM applications.
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