qmk_firmware/docs/feature_key_lock.md

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# Key Lock
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Sometimes you may find yourself needing to hold down a specific key for a long period of time. Key Lock holds down the next key you press for you. Press it again, and it will be released.
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Let's say you need to type in ALL CAPS for a few sentences. Hit `QK_LOCK`, and then Shift. Now, Shift will be considered held until you tap it again. You can think of Key Lock as Caps Lock, but supercharged.
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## Usage
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First, enable Key Lock by setting `KEY_LOCK_ENABLE = yes` in your `rules.mk`. Then pick a key in your keymap and assign it the keycode `QK_LOCK`.
## Keycodes
|Keycode |Description |
|---------|--------------------------------------------------------------|
|`QK_LOCK`|Hold down the next key pressed, until the key is pressed again|
## Caveats
Key Lock is only able to hold standard action keys and [One Shot modifier](one_shot_keys.md) keys (for example, if you have your Shift defined as `OSM(MOD_LSFT)`).
This does not include any of the QMK special functions (except One Shot modifiers), or shifted versions of keys such as `KC_LPRN`. If it's in the [Basic Keycodes](keycodes_basic.md) list, it can be held.
Switching layers will not cancel the Key Lock. The Key Lock can be cancelled by calling the `cancel_key_lock()` function.