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Keyboard keys (buttons) typically have a set of characters [[Engraving|engraved]] or [[Printing|printed]] on them, and each press of a key typically corresponds to a single written [[symbol]]. However, producing some symbols may require pressing and holding several keys simultaneously or in sequence.<ref>{{cite book
|title=New Directions in Behavioral Biometrics
|url=https://
|isbn=978-1315349312
|author=Khalid Saeed
|date=2016
| publisher=CRC Press |access-date=6 August 2018
▲|url-status=live
}}</ref>
While most keys produce [[character (computing)|characters]] ([[Letter (alphabet)|letters]], [[Numerical digit|numbers]] or symbols), other keys (such as the [[escape key]]) can prompt the computer to execute system commands. In a modern computer, the interpretation of key presses is generally left to the software: the information sent to the computer, the [[scan code]], tells it only which physical key (or keys) was pressed or released.<ref name="msusb13a">[http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc Microsoft Keyboard Scan Code Specification] {{Webarchive|url=https://web.archive.org/web/20200909230403/https://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc |date=9 September 2020 }} ([http://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/scancode.doc Appendix C, "USB Keyboard/Keypad Page (0x07)"] ), [[Microsoft]]. Revision 1.3a, 2000-03-16, accessed 2018-10-13.</ref>
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