threebutton

Threebutton refers to an input configuration or device featuring three distinct clickable inputs. The term is most commonly used to describe three-button mice, which typically include left-click, middle-click (often activated by pressing the scroll wheel), and right-click. This arrangement enables a broader set of standard desktop actions and has been supported across major operating systems since the early days of graphical user interfaces.

History and evolution show that three-button mice became common in the 1990s as computer mice evolved beyond the traditional two-button design. Some models place the middle button as a separate physical button, while others rely on the scroll wheel to provide that middle-click function. In many devices, the middle button can be remapped or customized, allowing users to tailor behavior to specific applications or workflows.

Functionality and variations vary by device and software. In typical configurations, left-click performs selection, right-click opens context menus, and middle-click often triggers actions such as opening a link in a new tab, pasting text in certain environments, or panning in design and mapping software. Some threebutton mice include additional features such as programmable buttons, higher-resolution sensors, or integrated wheel scrolling with tilt or press capabilities. On some platforms, software drivers or window managers support specific mappings for the three-button scheme, improving accessibility and productivity.

Applications and considerations. The three-button layout remains common in desktop navigation, graphic design, and CAD workflows, where distinct mouse actions speed up tasks. Modern alternatives include multi-button mice with more inputs and touch-enabled devices, but the basic three-button paradigm persists in many setups and operating environments. See also: two-button mouse, four-button mouse, middle click, context menu.