The shift key is a modifier key on a keyboard, used to type capital letters and other alternate "upper" characters. There are typically two shift keys, on the left and right sides of the row below the home row. The shift key's name originated from the typewriter, where one had to press and hold the button to shift up the case stamp to change to capital letters; the shift key was first used in the Remington No. 2 Type-Writer of 1878; the No. 1 model was capital-only.
The keyboard symbol for the Shift key (which is called Level 2 Select key in the international standard series ISO/IEC 9995) is given in ISO/IEC 9995-7 as symbol 1, and in ISO 7000 "Graphical symbols for use on equipment" as a directional variant of the symbol ISO-7000-251. In Unicode 6.1, the character approximating this symbol best is U+21E7 upwards white arrow (?). This symbol is commonly used to denote the Shift key on modern keyboards (especially on non-US layouts and on the Apple Keyboard), sometimes in combination with the word "shift" or its translation in the local language. This symbol also is used in texts to denote the shift key.
On some keyboards, if both shift keys are held down simultaneously only some letters can be typed. For example, on the Dell keyboard Model RT7D20 only 16 letters can be typed. This phenomenon is known as "masking" and is a fundamental limitation of the way the keyboard electronics are designed.
The following is a list of actions involving the shift key for the Microsoft Windows operating system.
|Press ++||Opens the Windows Task Manager.||3.1+|
|Hold + click Restart||Reboots Windows only and not the entire system.||95, 98, ME|
|Hold + insert CD||Holding shift while inserting a compact disc in a Microsoft Windows computer will bypass the autorun feature. This ability has been used to circumvent the MediaMax CD-3 CD copy protection system.||95+|
|Hold + click close button||In Windows Explorer, closes the current folder and all parent folders.||95+|
|Press +||In Windows Explorer, if pressed with objects selected, such as files and folders, this will bypass the recycle bin and delete the selected objects permanently. Alternatively, holding shift and selecting the delete option in the context menu of the selected objects will achieve this. Retrieving deleted objects after this is only possible using recovery software.||95+|
|Press +||Focuses on the previous object in the objects that are focusable in many Windows applications, such as the previous form control on a form in Internet Explorer.||3.1+|
|Press 5 times||Toggles activation of StickyKeys on and off.||95+|
|Hold the right for 8 seconds||Toggles activation of FilterKeys on and off.||95+|
|Press both keys||Inactivates StickyKeys if it is activated.||95+|
|Press left + left +||Toggles activation of MouseKeys on and off.||95+|
|Press left + left +||Toggles activation of High Contrast on and off.||95+|
|Press ++||Highlights the last task in the task bar. Continue to cycle through the task bar with the arrow keys, + (forward), ++ (backwards), or alphanumeric keys (highlights the task that begins with the alphanumeric character that is pressed). Press or to open the task.||95+|
|Press ++||Displays a list of the tasks in the task bar for as long as the is held down. Selects the last task in the list. Continue to cycle through the list by pressing +. Release to open the selected task.||3.1+|
|Press ++||Selects the previous tabbed window in any Windows applications is that use the tabbed window control.||3.1+|