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 Introduced in 1995, the Windows keyboard superseded the 101-key Enhanced keyboard and added three keys specialized for Windows.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 Key A 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.