In an online environment, the primary visual layouts are screens and windows. A window is one of the graphical objects used by the type of interface called graphical user interface. GUIs provide great flexibility and user-controlled actions. A screen is a terminal-based interface, one in which the user interacts with the system using a dumb terminal or a PC with terminal emulation. The system drives the dialog of the user and restricts options to what the menus provide. The work pattern for the user is basically system-controlled procedural tasks.
GUI-based applications let the user drive the screen. Terminal-based interfaces offer the user predetermined routes and restrict input.
Each screen provides the user interface for one procedure step or single-step procedure. When you design a screen, you are creating a visual layout of the import and export views of a specific procedure step that was defined using the Dialog Design tool.
You create a screen using the Screen Design tool.
You design screens only for online procedure steps. You do not design screens for batch procedure steps. The primary visual layout in a batch environment is not a screen or window, but rather a report.
Note: Batch is only available on MVS.
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