The other type of interface that you can create with CA Gen is a screen interface, which is used for terminal-based applications. Terminal-based applications are also known as block mode or 3270 applications. For a screen interface, each procedure may have only one screen. A one-to-one mapping exists between them. For a GUI, each procedure may have one or more windows. A one-to-many mapping exists between them. For both types of interfaces, a procedure may implement one or more elementary processes.
For screen interfaces, the application controls the dialog of the user and restricts options by what the menus provide. The interface suits a work pattern of procedural tasks controlled by the application. For GUIs, the application gives the user more control and lets the user continue with tasks, cancel tasks, and switch to other parts of the application. The interface suits a work pattern of information gathering tasks rather than just procedural tasks. The interface offers a more user-centered design and use of the desktop as a collection of tools.
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