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Each real user is associated with a 3270-type terminal with a display screen that supports either one or two logical windows at any time.
Virtual users have no real terminals associated with them, but operate logically as if they own one real line mode window.
Associated with each window that a user operates is at least one primary processing environment. A processing environment provides the internal services and facilities that are required to execute NCL processes for the user from its associated window.
Real users, using real terminals, can have one or two windows and therefore can have one or two active NCL processing environments directly associated with these windows. Internal users have only one window (logically operating in line mode) and therefore have only one NCL processing environment.
An NCL process always operates within the NCL processing environment associated with the window from which it was invoked.
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