The traditional Windows/Mac keyboard shortcut to undo the last operation is Ctrl or Cmd and what key?
Undo user, the "history buffer(s)," which store the completed actions, the "undo/redo manager" for controlling the history buffer and the "user interface" for interacting with the user. In most Windows applications, the Undo command is activated by pressing the Ctrl+Z or Alt+Backspace keybindings. In all Macintosh applications, the Undo command is activated by pressing Command-Z. The common command for Redo on Microsoft Windows systems is Ctrl+Y or Ctrl+Shift+Z. The common command for Redo on Apple Macintosh systems is Command-Shift-Z. The ability to undo an operation on a computer was independently invented multiple times, as a response to how people used computers.
Keyboard shortcut sequences. Keyboard shortcut In computing, a keyboard shortcut is a series of one or several keys, such as "Ctrl+F" to search a character string. Such a directive invokes a software or operating system operation (in other words, cause an event) when triggered by the user. The meaning of term "keyboard shortcut" can vary depending on software manufacturer. For instance, Microsoft differentiates keyboard shortcuts from hotkeys ("mnemonics" on Windows) whereby the former consists of a specific key combination used to trigger an action, and the latter represents a designated letter in a menu command or toolbar button that when pressed together