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break key : ウィキペディア英語版
break key

The Break key of a computer keyboard refers to breaking a telegraph circuit, and originated with 19th century practice. In modern usage, the key has no well-defined purpose, but while this is the case it can be used by software for miscellaneous tasks, such as to switch between multiple login sessions, to terminate a program, or to interrupt a modem connection.
Because the break function is usually combined with the pause function on one key since the introduction of the IBM Model M 101-key keyboard in 1985, the Break key is also called the Pause key. It can be used to pause some games, such as ''Deus Ex'' and the ''Call Of Duty'' series.
==History==
A standard telegraph circuit connects all the keys, sounders and batteries in a single series loop. Thus the sounders actuate only when both keys are down (closed, also known as "marking" — after the ink marks made on paper tape by early printing telegraphs). So the receiving operator has to hold his key down, or close a built-in shorting switch, in order to let the other operator send. As a consequence the receiving operator could interrupt the sending operator by opening his key, breaking the circuit and forcing it into a "spacing" condition. Both sounders stop responding to the sender's keying, alerting the sender. (A physical break in the telegraph line would have the same effect.)

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「break key」の詳細全文を読む



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