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** produces [[user feedback]] based on user input and the system's state.
Consider for example the process of deleting a file using a [[contextual menu]]. This assumes the existence of a mouse (input device), a screen (output device), and a piece of code that paints a menu and updates its selection (user feedback) and sends a [[command]] to the file system when the user clicks on the "delete" item (interpretation). User feedback can be further used to confirm that the command has been invoked.
=== The user's view ===
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