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Many, but not all, computer keyboards have a numeric keypad to the right of the alphabetic keyboard, often separated from the other groups of keys such as the function keys and system command keys, which contains numbers, basic mathematical symbols (e.g., addition, subtraction, etc.), and a few function keys.
Mouse keys is a feature of some graphical user interfaces that uses the keyboard (especially numeric keypad) as a pointing device (usually replacing a mouse). Its roots lie in the earliest days of visual editors when line and column navigation was controlled with arrow keys .
When typing on a keyboard, a person should keep the shoulders relaxed with the elbows at the side, with the keyboard and mouse positioned so that reaching is not necessary. The chair height and keyboard tray should be adjusted so that the wrists are straight, and the wrists should not be rested on sharp table edges. [20]
A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...
A key at E00 is not required, but when it is present on the keyboard, the positions E13 and B00 (shown in red) may have no key (e.g. the US layout with the Backspace or Delete key at E14 enlarged to E13 and the left Shift key at B99 enlarged to B00); but most international layouts having a key at E00 also have at least one key on E13 (with a ...
Most keyboard shortcuts require the user to press a single key or a sequence of keys one after the other. Other keyboard shortcuts require pressing and holding several keys simultaneously (indicated in the tables below by the + sign). Keyboard shortcuts may depend on the keyboard layout.
The main reason for this arrangement is that the arrow keys are not ergonomic to use with a right-handed mouse. During the early days of gaming, this was not a problem as the mouse was not used; the arrow keys controlled both movement ↑ ↓ as well as looking around ← →, with strafing done using modifier keys (usually Alt + ← →).
One workaround was the double click, first used on the Lisa, to allow both the “select” and “open” operation to be performed with a single button. Another workaround has the user hold down one or more keys on the keyboard before pressing the mouse button (typically control on a Macintosh for contextual menus). This has the disadvantage ...