The shift key is a modifier key on a keyboard, used to type capital letters and other alternate "upper" characters. It is also used to access the special characters on the number keys and other double character keys on the keyboard!
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The shift key allows the user to type an uppercase letter - a capital. When there are two symbols on a key, the shift key allows the user to type the uppoermost character. In combination with other keys, such as the alt key, or the control key, it allows the user to perfom shortcuts for menuitems.
The shift key (a bold up arrow) is responsible for, when being held down, writing capital letters when hitting a second key, for example 'H', 'E' and 'X'. Another thing it can be used for is making number keys symbols (6 to ^, 2 to ", 5 to %), or symbols not requiring shift to change into different ones when using it (. to >, = to +, ' to @). Pressing it five times without doing anything else causes StickyKeys to activate, which enables you to use that, Ctrl, Alt and the windows logo key by pressing one key at a time.
when you press the shift+what ever you want to press except (F1 to F12) and also the (PrtSc SysRp,Pause Break,Ins,Del,Home,Pg Up,Pg Dn,End,Ctrl,AltGr,Fn,Caps Lock,Tab and Esc) and also the arrows in the keyboard
The purpose of he shift key is to change the case of the letters on the keyboard from lower to upper. Also to use the symbols on the numbers and on the double symbol keys.
The Shift-key's(located above Ctrl) main function is capital letters and access to the special signs like the one's on 1-0 keys.
Other functions depends on the software used.