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The communication facilities of IMS/VS permit the user to construct networks of on-line system executions, with each execution controlling a configuration of lines and terminals of various types. Facilities are provided for the transmission of commands and responses between a terminal and its controlling execution, and for the transmission of messages between a terminal and an application program or another terminal located anywhere in the network. Communication facilities include security facilities to control terminal access to the network, and editing facilities to simplify the application programming of communication functions. Network resources are controlled from the master terminals that are associated with on-line executions.
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