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AltGr (also Alt Graph, Alt Graphic, Alt Graphics, Alt Car, or Right Alt) is a modifier key found on some computer keyboards and is primarily used to type characters that are unusual for the locale of the keyboard layout, such as currency symbols and accented letters. On a typical, IBM-compatible PC keyboard, the AltGr key, when present, takes the place of the right-hand Alt key. In OS X, the Option key has functions similar to the AltGr key. AltGr is used similarly to the Shift key: it is held down when another key is struck in order to obtain a character other than the one that the latter normally produces. AltGr and Shift can also sometimes be combined to obtain yet another character. For example, on the US-International keyboard layout, the C key can be used to insert four different characters:* → c (lower case — first level) * → C (upper case — second level) * → © (copyright sign — third level) * → ¢ (cent sign — fourth level) == Meaning == The meaning of the key's abbreviation is not explicitly given in many IBM PC compatible technical reference manuals. However, IBM states that ''AltGr'' is an abbreviation for ''alternate graphic'',〔〔 and Sun keyboards label the key as ''Alt Graph''. AltGr was originally introduced as a means to produce box-drawing characters, also known as pseudographics, in text user interfaces.〔 These characters are, however, much less useful in graphical user interfaces, and rather than ''alternate graphic'' the key is today used to produce ''alternate graphemes''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AltGr key」の詳細全文を読む スポンサード リンク
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