High Quality Content by WIKIPEDIA articles! The IBM PC keyboard and its derivative computer keyboards are standardized. However, during the 20 years of the PC architecture being constantly updated, several types of keyboards have been developed.Common additions to the standard layouts include additional power management keys, volume controls, media player controls, and miscellaneous user-configurable short-cuts for e-mail client, web browser, etc. The PC keyboard with its various keys has a long history of evolution reaching back to teletypewriters. In addition to the 'old' standard keys, the PC keyboard has accumulated several special keys over the years. Some of the additions have been inspired by the opportunity or requirement for improving user productivity with general office application software, while other slightly more general keyboard additions have become the factory standards after being introduced by certain operating system or GUI software vendors such as Microsoft.

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