The user interface of a software application or operating system is sometimes described as redundant if the same task can be executed by several different methods. For example, a user is often able to open or save a project by navigating a menu with the mouse, by clicking a single button with the mouse, or by entering a key stroke. The user interface is the part of a system exposed to users. ... Application software is a subclass of computer software that employs the capabilities of a computer directly to a task that the user wishes to perform. ... Jump to: navigation, search In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. ... Operating a mechanical 1: Pulling the mouse turns the ball. ... A keyboard shortcut (also known as an accelerator key, shortcut key, or hotkey) is one or a set of keyboard keys that, when pressed simultaneously, perform a predefined task. ...

Also Redundancy is the ability of computer parts, eg harddisks, memory and memory chips to recover or have copies of the same information with little or no damage to that infomation and or have contents of last best status incase of virus attack, physical damage, fire or such.