Before revision: Its roots lie in the earliest days of visual editors when line and column navigation was controlled with arrow keys Today, mouse keys usually refers to the numeric keypad layout standardized with the introduction of the X Window System in 1984.The X Keyboard Extension: Protocol SpecificationThe X Keyboard Extension: Library Specification LayoutX window system MouseKeys default numpad layout key action Num Lock With Alt-ShiftEnable/Disable MouseKeys 8 cursor up 2 cursor down 6 cursor right 4 cursor left 7 cursor up and left 9 cursor up and right 3 cursor down and right 1 cursor down and left / select primary button * select modifier button - select alternate button 5 click selected button + double click selected button 0 depress selected button .
After revision: Its roots lie in the earliest days of visual editors when line and column navigation was controlled with arrow keys Today, mouse keys usually refers to the numeric keypad layout standardized with the introduction of the X Window System in 1984.The X Keyboard Extension: Protocol SpecificationThe X Keyboard Extension: Library Specification key action Num Lock With Alt-ShiftEnable/Disable MouseKeys 8 cursor up 2 cursor down 6 cursor right 4 cursor left 7 cursor up and left 9 cursor up and right 3 cursor down and right 1 cursor down and left / select primary button * select modifier button - select alternate button 5 click selected button + double click selected button 0 depress selected button .