![]() ![]() For example, on some keyboard layouts, the acute accent key is a dead key in this case, striking acute accent then a results in á. Many languages use the Roman alphabet and have diacritically-marked letters for which unique keys do not exist on all keyboards. On some systems, there is no indication to the user that a dead key has been struck, but in some text-entry systems the diacritical mark is displayed along with an indication that the system is waiting for another keystroke: either the base character to be marked, an additional diacritical mark, or space to produce the diacritical mark in isolation. There are also function keys, with various functions as determined by software.Ī dead key or key combination does not generate a character when struck, but modifies the character generated by the key struck immediately after. These, along with shift, caps lock, option, command, and the like are called modifier keys. The common keyboard structure also includes the control and alternative ( alt) keys. This secondary shift key is marked Alt Gr or option on many systems. These symbols may appear to the right of the main symbols on the keys, or they may be unmarked. Keyboards often have what is effectively a secondary shift key, used to type symbols beyond the two otherwise available with each key. The shift key is also used to type the upper of two symbols on a given key, the lower being typed without using the shift key. 5 Keyboard layouts for non-Roman alphabetic scriptsĪ key labeled with only a single letter (usually the capital form) can generally be struck to type either a lower case or a capital letter, the latter requiring the simultaneous holding of the shift key, often labeled “⇧”.4.6 Other original layouts and layout design software.4.5 Chorded keyboards and mobile devices.4 Non-QWERTY keyboards for Roman scripts.3.2.6 Swiss German, Swiss French, Swiss Italian, Liechtenstein, Luxembourg.3.2.5 Bosnian, Croatian, Serbian (Latin) and Slovene.3.2.3 Germany and Austria (but not Switzerland).3 QWERTY based layouts for Roman script. ![]()
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