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ISO/IEC 9995 Information technology — Keyboard layouts for text and office systems is an ISO/IEC standard series defining layout principles for computer keyboards. It does not define specific layouts but provides the base for national and industry standards which define such layouts.
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 common computer input device, a keyboard. A user presses a key which transfers information to a computer. In computing, an input device is a piece of equipment used to provide data and control signals to an information processing system, such as a computer or information appliance.
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]
Numeric keyboards contain only numbers, mathematical symbols for addition, subtraction, multiplication, and division, a decimal point, and several function keys. They are often used to facilitate data entry with smaller keyboards that do not have a numeric keypad, commonly those of laptop computers. [18]
Even then the objects being stored might not be characters, for instance the variable-length UTF-16 is often stored in arrays of char16_t. Other languages also have a char type. Some such as C++ use at least 8 bits like C. [ 7 ] Others such as Java use 16 bits for char in order to represent UTF-16 values.
On-screen keyboards can be used to type and enter data without using the physical keyboard. An on-screen keyboard may contain all the standard keys including all letters, numbers, symbols, and system keys like Home, End, Insert, Page Up and Page Down, Ctrl, Alt, Caps, and Shift, and can even extend the set of characters available by simulating ...
In Microsoft Windows, there are keyboard layouts, such as Swiss German, whose keys generate unrelated, non-uppercase symbols when pressed before ⇧ Shift. [9], creating a 5th level (and a 6th level when ⇪ Caps Lock is on and ⇧ Shift is pressed) for typing symbols on a single key. Below is an example using the Swiss German keyboard layout ...