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In addition, a few keys send longer scancodes, effectively emulating a series of keys to make it easier for different types of software to process. PC keyboards since the PS/2 keyboard support up to three scancode sets. The most commonly encountered are the "XT" ("set 1") scancodes, based on the 83-key keyboard used by the IBM PC XT and earlier ...
Keystroke logging, often referred to as keylogging or keyboard capturing, is the action of recording (logging) the keys struck on a keyboard, [1] [2] typically covertly, so that a person using the keyboard is unaware that their actions are being monitored. Data can then be retrieved by the person operating the logging program.
The behavioral biometric of keystroke dynamics uses the manner and rhythm in which an individual types characters on a keyboard or keypad. [ 13 ] [ 14 ] [ 15 ] The user's keystroke rhythms are measured to develop a unique biometric template of the user's typing pattern for future authentication. [ 7 ]
The program was first unveiled in 2009 as a spin-off of the scanning master software for Windows Scanitto Lite that replaced different standard scanning tools supplied with the TWAIN scanners. During the first years after invention, the software got the criticism from the independent reviewers for the absence of OCR features. [ 2 ]
A common test for whether the computer has crashed is pressing the "caps lock" key. The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way.
The first mark sense scanner was the IBM 805 Test Scoring Machine; this read marks by sensing the electrical conductivity of graphite pencil lead using pairs of wire brushes that scanned the page. In the 1930s, Richard Warren at IBM experimented with optical mark sense systems for test scoring, as documented in US Patents 2,150,256 (filed in ...
Key rollover is the ability of a computer keyboard to correctly handle several simultaneous keystrokes. A keyboard with n-key rollover (NKRO) can correctly detect input from each key on the keyboard at the same time, regardless of how many other keys are also being pressed. Keyboards that lack full rollover will register an incorrect keystroke ...
QMK (Quantum Mechanical Keyboard [2]) is open-source firmware for microcontrollers that control computer keyboards. [ 3 ] [ 4 ] [ 5 ] The QMK Configurator is freely available software which facilitates designing keyboard layouts and then turning them into firmware files.