A 104-key keyboard (U.S. layout) that is the de facto standard keyboard included with new desktop PCs. Introduced in 1995, the Windows keyboard superseded the 101-key Enhanced keyboard and added three keys specialized for Windows.Two Windows and One Menu KeyA key with the Windows logo was added on each side of the space bar, which activates the Start menu/screen and other functions (see Windows key). A third Menu key was included as an alternative to right clicking the mouse. Also called the "Context Menu key." See PC keyboard.