 As the GE network grew, the Mark III mainframes were eventually located in three processing centers called Supercenters.The center in Brook Park, Ohio, was supplemented by first one in Rockville, Maryland (1974) and in (1977) Amstelveen, The Netherlands.All were completely networked and equally accessible from anywhere in the world, allowing GE to move load from one center to another and transmit off-site backups for disaster recovery purposes.