High Quality Content by WIKIPEDIA articles! In the X Window System, the X keyboard extension or XKB extends the ability to control the keyboard over what is offered by the X Window System core protocolThe extension is composed of two parts: a server extension and a client library. Modern versions of Xlib contain XKB, which is active by default. Client programs not using this extension can deactivate it before connecting with the server, or can simply work normally as the extension simulates the core protocol by default.XKB allows a modifier to be locked or latched, other than being in its regular state. Normally, a modifier is active exactly when it is pressed, like the Shift. However, a modifier may also be locked, like the caps lock modifier. In particular, when a modifier is locked it remains active until it is explicitly deactivated. An intermediate condition between regular and locked is the latched state: when a modifier is latched it remains active, but only until the next non-modifier key is pressed.

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