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  2. 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 ...

  3. 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.

  4. 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]

  5. Table of keyboard shortcuts - Wikipedia

    en.wikipedia.org/wiki/Table_of_keyboard_shortcuts

    For the first two shortcuts going backwards is done by using the right ⇧ Shift key instead of the left. Fn or ⌘ Cmd+Space on older devices (not MBR) Configure desired keypress in Keyboard and Mouse Preferences, Keyboard Shortcuts, Select the next source in Input menu. [1] Ctrl+Alt+K via KDE Keyboard. Alt+⇧ Shift in GNOME. Ctrl+\ Ctrl ...

  6. 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 ...

  7. Pitch of brass instruments - Wikipedia

    en.wikipedia.org/wiki/Pitch_of_brass_instruments

    The fundamental frequency of the harmonic series can be varied by adjusting the length of the tubing using the instrument's valve, slide, key or crook system, while the player's embouchure, lip tension and air flow serve to select a specific harmonic from the available series for playing. The fundamental is essentially missing from the ...

  8. Keyboard layout - Wikipedia

    en.wikipedia.org/wiki/Keyboard_layout

    A typical 105-key computer keyboard, consisting of sections with different types of keys. A computer keyboard consists of alphanumeric or character keys for typing, modifier keys for altering the functions of other keys, [1] navigation keys for moving the text cursor on the screen, function keys and system command keys—such as Esc and Break—for special actions, and often a numeric keypad ...

  9. 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 ...