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  2. Sticky keys - Wikipedia

    en.wikipedia.org/wiki/Sticky_keys

    Sticky keys is an accessibility feature of some graphical user interfaces which assists users who have physical disabilities or helps users reduce repetitive strain injury. It serializes keystrokes; instead of being required to press multiple keys at a time, the user can press and release a modifier key , such as ⇧ Shift , Ctrl , Alt , or the ...

  3. Water key - Wikipedia

    en.wikipedia.org/wiki/Water_key

    Turning the instrument upside down and actuating the valves may also release fluid stuck in the valve slides into the main tubing of the instrument, where it can then be emptied by turning the instrument or by using a water key on the main tubing. Some trumpet designs, notably Bach Stradivarius trumpets in B♭, lack a water key on the third ...

  4. Keyboard technology - Wikipedia

    en.wikipedia.org/wiki/Keyboard_technology

    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 keyboard driver also tracks the shift, alt and control state of the keyboard.

  5. HP-19B - Wikipedia

    en.wikipedia.org/wiki/HP-19B

    HP-19B, introduced on 4 January 1988, along with the HP-17B, HP-27S and the HP-28S, and replaced by the HP-19BII (F1639A) in January 1990, [2] was a simplified Hewlett Packard business model calculator, like the 17B. It had a clamshell design, like the HP-18C, HP-28C and 28S. [3]

  6. Hewlett-Packard - Wikipedia

    en.wikipedia.org/wiki/Hewlett-Packard

    HP's stock dropped by about a further 40% after the company abruptly announced a number of decisions: to discontinue its webOS device business (mobile phones and tablet computers), the intent to sell its personal computer division (at the time HP was the largest personal computer manufacturer in the world), and to acquire British big data ...

  7. Keyed trumpet - Wikipedia

    en.wikipedia.org/wiki/Keyed_trumpet

    The harmonic trumpet, a silver trumpet in E♭ with crooks for D, C, and B♭ and four keys, was made by London instrument maker William Shaw for King George III in 1787. [6] Eric Halfpenny found that each key corresponds to one of the four crooks and raises the pitch by a fifth, providing a fuller range of notes by allowing the player to ...

  8. Break key - Wikipedia

    en.wikipedia.org/wiki/Break_key

    Break/Pause key on PC keyboard. The Break key (or the symbol ⎉) 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 ...

  9. Dead key - Wikipedia

    en.wikipedia.org/wiki/Dead_key

    A dead key is a special kind of modifier key on a mechanical typewriter, or computer keyboard, that is typically used to attach a specific diacritic to a base letter. [1] The dead key does not generate a (complete) character by itself, but modifies the character generated by the key struck immediately after. Thus, a dedicated key is not needed ...