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Larry Tesler created the concept of cut, copy, paste, and undo for human-computer interaction while working at Xerox PARC to control text editing.During the development of the Macintosh it was decided that the cut, paste, copy and undo would be used frequently and assigned them to the ⌘-Z (Undo), ⌘-X (Cut), ⌘-C (Copy), and ⌘-V (Paste).
Enable the Input menu (via the 'Input Sources' panel of the 'Keyboard' System Preferences). This gives access to: the Keyboard Viewer, which can be used to view and input characters accessed via the ⌥ Option key; the Character Viewer, which can be used to access any Unicode character. It is also available from the Special Characters tool
An early typewriter with a backspacer[sic] key.(Blickensderfer Model 7)Although the term "backspace" is the traditional name of the key which steps the carriage back and/or [note 3] deletes the previous character, typically to the left of the cursor, the actual key may be labeled in a variety of ways, for example delete, [1] erase, [note 4] or with a left pointing arrow. [3]