# KEYC_MASK_KEY

- **Language:** C
- **Kind:** constant
- **Source:** https://github.com/tmux/tmux/blob/3b929f332aafa7f1080eacc31feb11ffbb1d1841/tmux.h#L138
- **Page:** https://libtmux.org/en/tmux/3.2a/reference/c-define-tmux-h-keyc_mask_key/

```c
#define KEYC_MASK_KEY 0x000fffffffffffULL
```

## Referenced by

- [`cmd_display_panes_key`](/en/tmux/3.2a/reference/c-function-cmd-display-panes-c-cmd_display_panes_key/) (function)
- [`cmd_list_keys_exec`](/en/tmux/3.2a/reference/c-function-cmd-list-keys-c-cmd_list_keys_exec/) (function)
- [`input_key`](/en/tmux/3.2a/reference/c-function-input_key/) (function)
- [`key_string_lookup_key`](/en/tmux/3.2a/reference/c-function-key_string_lookup_key/) (function)
- [`KEYC_IS_MOUSE`](/en/tmux/3.2a/reference/c-define-tmux-h-keyc_is_mouse/) (constant)
- [`KEYC_IS_UNICODE`](/en/tmux/3.2a/reference/c-define-tmux-h-keyc_is_unicode/) (constant)
- [`server_client_key_callback`](/en/tmux/3.2a/reference/c-function-server-client-c-server_client_key_callback/) (function)
- [`tty_keys_extended_key`](/en/tmux/3.2a/reference/c-function-tty-keys-c-tty_keys_extended_key/) (function)
- [`tty_keys_next`](/en/tmux/3.2a/reference/c-function-tty_keys_next/) (function)