Variable name	Alias	Replaced with
alternate_on		If pane is in alternate screen
alternate_saved_x		Saved cusor X in alternate screen
alternate_saved_y		Saved cursor Y in alternate screen
buffer_sample		Sample of start of buffer
buffer_size		Size of the specified buffer in bytes
client_activity		Integer time client last had activity
client_created		Integer time client created
client_control_mode		1 if client is in control mode
client_height		Height of client
client_key_table		Current key table
client_last_session		Name of the client's last session
client_pid		PID of client process
client_prefix		1 if prefix key has been pressed
client_readonly		1 if client is readonly
client_session		Name of the client's session
client_termname		Terminal name of client
client_tty		Pseudo terminal of client
client_utf8		1 if client supports utf8
client_width		Width of client
command_name		Name of command in use, if any
cursor_flag		Pane cursor flag
cursor_x		Cursor X position in pane
cursor_y		Cursor Y position in pane
history_bytes		Number of bytes in window history
history_limit		Maximum window history lines
history_size		Size of history in bytes
host	#H	Hostname of local host
host_short	#h	Hostname of local host (no domain name)
insert_flag		Pane insert flag
keypad_cursor_flag		Pane keypad cursor flag
keypad_flag		Pane keypad flag
line		Line number in the list
mouse_any_flag		Pane mouse any flag
mouse_button_flag		Pane mouse button flag
mouse_standard_flag		Pane mouse standard flag
pane_active		1 if active pane
pane_bottom		Bottom of pane
pane_current_command		Current command if available
pane_dead		1 if pane is dead
pane_dead_status		Exit status of process in dead pane
pane_height		Height of pane
pane_id	#D	Unique pane ID
pane_in_mode		If pane is in a mode
pane_input_off		If input to pane is disabled
pane_index	#P	Index of pane
pane_left		Left of pane
pane_pid		PID of first process in pane
pane_right		Right of pane
pane_start_command		Command pane started with
pane_synchronized		If pane is synchronized
pane_tabs		Pane tab positions
pane_title	#T	Title of pane
pane_top		Top of pane
pane_tty		Pseudo terminal of pane
pane_width		Width of pane
pid		Server PID
scroll_region_lower		Bottom of scroll region in pane
scroll_region_upper		Top of scroll region in pane
scroll_position		Scroll position in copy mode
session_alerts		List of window indexes with alerts
session_attached		Number of clients session is attached to
session_activity		Integer time of session last activity
session_created		Integer time session created
session_last_attached		Integer time session last attached
session_group		Number of session group
session_grouped		1 if session in a group
session_height		Height of session
session_id		Unique session ID
session_many_attached		1 if multiple clients attached
session_name	#S	Name of session
session_width		Width of session
session_windows		Number of windows in session
socket_path	Server socket path
start_time		Server start time
window_activity		Integer time of window last activity
window_active		1 if window active
window_bell_flag		1 if window has bell
window_find_matches		Matched data from the find-window
window_flags	#F	Window flags
window_height		Height of window
window_id		Unique window ID
window_index	#I	Index of window
window_last_flag		1 if window is the last used
window_layout		Window layout description, ignoring zoomed window panes
window_linked		1 if window is linked across sessions
window_name	#W	Name of window
window_panes		Number of panes in window
window_silence_flag		1 if window has silence alert
window_visible_layout		Window layout description, respecting zoomed window panes
window_width		Width of window
window_zoomed_flag		1 if window is zoomed
wrap_flag		Pane wrap flag