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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.
Keyboard overlays - a fake keypad is placed over the real one so that any keys pressed are registered by both the eavesdropping device as well as the legitimate one that the customer is using. [2] Key commands - exist in much legitimate software. These programs require keyloggers to know when you’re using a specific command.
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 ...
The actual logic is contained in event-handler routines. These routines handle the events to which the main program will respond. For example, a single left-button mouse-click on a command button in a GUI program may trigger a routine that will open another window, save data to a database or exit the application.
This is drawn schematically as a matrix of 8 columns and 8 rows of wires, with a switch at every intersection. The keyboard controller scans the columns. If a key has been pressed, the controller scans the rows, determines the row-column combination at which a key has been pressed, and generates the code corresponding to that key.
A hardware interrupt generated when a key is pressed or released, see keyboard controller (computing) Topics referred to by the same term This disambiguation page lists articles associated with the title Keyboard interrupt .
The <modifier> is normally omitted if no modifier keys are pressed, but most implementations always emit the <modifier> for F1–F4. (draft section) (draft section) Xterm has a comprehensive documentation page on the various function-key and mouse input sequence schemes from DEC's VT terminals and various other terminals it emulates. [ 13 ]
The event loop waits for an incoming event: if this event is a key press, the application exits; if it is an expose event, the window content is drawn. The function XNextEvent blocks and flushes the request buffer if there is no event in the queue.