What technology company created the Group Control System operating system and is located in Armonk, New York?
Group Control System Group Control System (GCS) is an operating system made by IBM, meant to run as a guest of 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.
Yankee Group Yankee Group was an independent technology research and consulting firm, founded in 1970 by Howard Anderson. It was acquired by 451 Research in 2013.