CDI versus GUI Interface
As discussed previously, the operating system provides the user interface through which you communicate and control the actions of the operating system itself, and the PC hardware it is installed upon. For example, you install and configure the Operating System, troubleshoot it if things go wrong, identify yourself to the system (by logging in), start programs and use hardware such as a printer. Simply put, the user interface is the on-screen display mechanism used to allow you to interact with the operating system, and to see the feedback and results of your actions.
There are two primary types of computer user interfaces: the Command Driven Interface (CDI) and the Graphical User Interface (GUI).
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