Here is a list of all documented functions, variables, defines, enums, and typedefs with links to the documentation:

### - _ -

- _airport_terminal_state : aircraft_cmd.cpp
- _all_grfs : newgrf_config.cpp , newgrf_config.h
- _amplitudes_by_smoothness_and_frequency : tgp.cpp
- _animated_tile_allocated : animated_tile.cpp , animated_tile_sl.cpp
- _animated_tile_chunk_handlers : animated_tile_sl.cpp
- _animated_tile_count : animated_tile.cpp , animated_tile_sl.cpp , oldloader_sl.cpp
- _animated_tile_list : animated_tile.cpp , animated_tile_sl.cpp , oldloader_sl.cpp
- _animcursors : animcursors.h
- _available_graphics_sets : gfxinit.cpp
- _breakdown_speeds : train_cmd.cpp
- _build_depot_direction : rail_gui.cpp
- _build_depot_widgets : rail_gui.cpp
- _build_industry_desc : industry_gui.cpp
- _build_industry_widgets : industry_gui.cpp
- _build_rail_widgets : rail_gui.cpp
- _build_road_button_proc : road_gui.cpp
- _build_road_depot_widgets : road_gui.cpp
- _build_road_scen_widgets : road_gui.cpp
- _build_road_widgets : road_gui.cpp
- _build_signals_animcursor : animcursors.h
- _build_tramway_widgets : road_gui.cpp
- _build_waypoint_widgets : rail_gui.cpp
- _changed_storage_arrays : newgrf_storage.cpp
- _cmf_info : company_manager_face.h
- _coal_plant_sparks : industry_land.h
- _colour_gradient : gfx.cpp , gfx_func.h
- _command_proc_table : command.cpp
- _company_colours : company_cmd.cpp , company_func.h
- _company_manager_face : company_cmd.cpp , company_func.h
- _convert_signal_button : rail_gui.cpp
- _ctrl_pressed : gfx.cpp , gfx_func.h
- _cur_company_tick_index : company_base.h , company_cmd.cpp
- _cur_month : date.cpp , date_func.h
- _cur_palette : gfx.cpp , gfx_func.h
- _cur_railtype : rail_gui.cpp
- _cur_signal_type : rail_gui.cpp
- _cur_signal_variant : rail_gui.cpp
- _cur_town_ctr : town.h , town_cmd.cpp
- _cur_town_iter : town.h , town_cmd.cpp
- _cur_waypoint_type : rail_gui.cpp
- _cur_year : date.cpp , date_func.h
- _current_action : gamelog.cpp
- _current_news : news_gui.cpp
- _currentLangID : newgrf_text.cpp
- _date : date.cpp , date_func.h
- _dbgofs : gamelog.cpp
- _default_refitmasks_rail : newgrf.cpp
- _demolish_animcursor : animcursors.h
- _dirkeys : gfx.cpp , gfx_func.h
- _DoCommandReturnSetOrderFlags() : ai_order.cpp
- _drag_delta : window.cpp
- _dragging_window : window.cpp
- _engine_counts : engine.cpp , engine_func.h
- _engine_id_mapping_desc : engine_sl.cpp
- _engine_offsets : engine.cpp , engine_func.h
- _enterdir_to_trackbits : signal.cpp
- _enterdir_to_trackdirbits : signal.cpp
- _expenses_list_1 : company_gui.cpp
- _expenses_list_2 : company_gui.cpp
- _factory_sounds : build_industry.h
- _farm_sounds : build_industry.h
- _ffb_64 : bitmath_func.cpp , bitmath_func.hpp
- _file_modetotype : misc_gui.cpp
- _fios_items : fios.cpp , fios.h
- _flood_from_dirs : water_cmd.cpp
- _forced_news : news_gui.cpp
- _gamelog_action : gamelog.cpp , gamelog_internal.h
- _gamelog_action_type : gamelog.cpp
- _gamelog_actions : gamelog.cpp , gamelog_internal.h
- _gamelog_print_level : gamelog.cpp
- _GenerateWorld() : genworld.cpp
- _gft_names : gfxinit.cpp
- _globset : signal.cpp
- _grfconfig : newgrf_config.cpp , newgrf_config.h
- _grfconfig_newgame : newgrf_config.cpp , newgrf_config.h
- _grfconfig_static : newgrf_config.cpp , newgrf_config.h
- _height_map : tgp.cpp
- _iconsole_aliases : console.cpp , console_internal.h
- _iconsole_cmds : console.cpp , console_internal.h
- _iconsole_vars : console.cpp , console_internal.h
- _industry_counts : industry.h , industry_cmd.cpp
- _industry_directory_desc : industry_gui.cpp
- _industry_directory_widgets : industry_gui.cpp
- _industry_draw_tile_data : industry_land.h
- _industry_view_desc : industry_gui.cpp
- _industry_view_widgets : industry_gui.cpp
- _input_events_this_tick : window.cpp
- _interactive_random : random_func.cpp , random_func.hpp
- _invalid_rect : gfx.cpp
- _keyboard_opt : osk_gui.cpp , textbuf_gui.h
- _last_owner : signal.cpp
- _last_railbridge_type : bridge_gui.cpp
- _last_roadbridge_type : bridge_gui.cpp
- _latest_news : news_gui.cpp
- _left_button_clicked : gfx.cpp , gfx_func.h
- _left_button_down : gfx.cpp , gfx_func.h
- _legend_from_industries : smallmap_gui.cpp
- _legend_land_contours : smallmap_gui.cpp
- _list_group_names : settings.cpp
- _lower_land_animcursor : animcursors.h
- _m : map.cpp , map_func.h
- _map_height_bits : smallmap_gui.cpp
- _map_log_x : map.cpp
- _map_log_y : map.cpp
- _map_size : map.cpp
- _map_size_x : map.cpp
- _map_size_y : map.cpp
- _map_tile_mask : map.cpp , map_func.h
- _max_height : tgp.cpp
- _me : map.cpp , map_func.h
- _money_cheat_amount : cheat_gui.cpp
- _mouseover_last_w : window.cpp
- _network_game_list : network_gamelist.h
- _network_playas : network.cpp , network.h
- _newgrf_textrefstack : newgrf_text.cpp
- _news_subtype_data : news_gui.cpp
- _news_type_data : news_func.h , news_gui.cpp
- _newstation_builder_desc : rail_gui.cpp
- _newstation_builder_widgets : rail_gui.cpp
- _next_competitor_start : company_base.h , company_cmd.cpp
- _old_name_array : oldloader_sl.cpp , strings_sl.cpp
- _oldest_news : news_gui.cpp
- _order_goto_animcursor : animcursors.h
- _orders_train_widgets : order_gui.cpp
- _orders_widgets : order_gui.cpp
- _original_house_specs : town_land.h
- _original_railtypes : railtypes.h
- _other_orders_widgets : order_gui.cpp
- _palette_remap : gfx_func.h , gfxinit.cpp
- _palette_remap_grf : gfx_func.h , gfxinit.cpp
- _palette_reverse_remap : gfx_func.h , gfxinit.cpp
- _palmap_d2w : palette_convert.h
- _palmap_w2d : palette_convert.h
- _personal_dir : fileio.cpp , fileio_func.h
- _place_depot_extra : rail_gui.cpp
- _plastic_mine_sounds : build_industry.h
- _possible_trackdirs : ai_rail.cpp
- _quicktime_movie : qtmidi.cpp
- _quicktime_started : qtmidi.cpp
- _quicktime_state : qtmidi.cpp
- _quicktime_volume : qtmidi.cpp
- _rail_build_button_data : rail_gui.cpp
- _railstation : rail_gui.cpp
- _raise_land_animcursor : animcursors.h
- _random : random_func.hpp , random_func.cpp
- _remove_button_clicked : rail_gui.cpp
- _right_button_clicked : gfx.cpp , gfx_func.h
- _right_button_down : gfx.cpp , gfx_func.h
- _road_enter_dir_to_reachable_trackdirs : roadveh_cmd.cpp
- _road_exit_dir_to_incoming_trackdirs : roadveh_cmd.cpp
- _road_exit_tunnel_state : tunnelbridge_cmd.cpp
- _road_keycodes : road_gui.cpp
- _road_type_infos : road_gui.cpp
- _roadveh_depot_exit_trackdir : roadveh_cmd.cpp
- _roadveh_enter_depot_dir : road_cmd.cpp
- _rv_station_picker_widgets : road_gui.cpp
- _savegame_format : saveload.h , saveload.cpp
- _savegame_type : saveload_internal.h , gamelog.cpp , saveload.cpp
- _saveload_mode : misc_gui.cpp , fios.h
- _sawmill_sounds : build_industry.h
- _screen_disable_anim : gfx_func.h , gfx.cpp
- _searchpaths : fileio.cpp , fileio_func.h
- _select_company_manager_face_adv_desc : company_gui.cpp
- _select_company_manager_face_adv_widgets : company_gui.cpp
- _select_company_manager_face_desc : company_gui.cpp
- _select_company_manager_face_widgets : company_gui.cpp
- _settings_ai_npc_page : settings_gui.cpp
- _settings_ai_page : settings_gui.cpp
- _settings_client : settings.cpp , settings_type.h
- _settings_construction_page : settings_gui.cpp
- _settings_construction_signals_page : settings_gui.cpp
- _settings_economy_industries_page : settings_gui.cpp
- _settings_economy_page : settings_gui.cpp
- _settings_economy_towns_page : settings_gui.cpp
- _settings_game : settings.cpp , settings_type.h
- _settings_main_page : settings_gui.cpp
- _settings_newgame : settings_type.h , settings.cpp
- _settings_stations_cargo_page : settings_gui.cpp
- _settings_stations_page : settings_gui.cpp
- _settings_ui_display_page : settings_gui.cpp
- _settings_ui_interaction_page : settings_gui.cpp
- _settings_ui_page : settings_gui.cpp
- _settings_vehicles_autorenew_page : settings_gui.cpp
- _settings_vehicles_page : settings_gui.cpp
- _settings_vehicles_routing_page : settings_gui.cpp
- _settings_vehicles_servicing_page : settings_gui.cpp
- _settings_vehicles_trains_page : settings_gui.cpp
- _shift_pressed : gfx_func.h , gfx.cpp
- _signal_builder_desc : rail_gui.cpp
- _signal_builder_widgets : rail_gui.cpp
- _sl : saveload.cpp
- _sl_minor_version : gamelog.cpp , saveload.cpp
- _sl_version : saveload.cpp , gamelog.cpp
- _snow_line : landscape.cpp
- _station_builder_desc : rail_gui.cpp
- _station_builder_widgets : rail_gui.cpp
- _station_load_types : order_gui.cpp
- _stringwidth_table : gfx.cpp
- _svc : newgrf_station.cpp
- _switch_mode : openttd.h , gfx.cpp
- _tar_linklist : fileio.cpp
- _tbdset : signal.cpp
- _tbuset : signal.cpp
- _terraform_err_tile : terraform_cmd.cpp
- _tile_type_procs : landscape.cpp , tile_cmd.h
- _tile_type_road_procs : road_cmd.cpp
- _tile_type_town_procs : town_cmd.cpp
- _tileoffs_by_diagdir : map.cpp
- _tileoffs_by_dir : map.cpp
- _total_industries : industry_cmd.cpp , industry.h
- _total_news : news_gui.cpp
- _town_desc : town_sl.cpp
- _town_draw_tile_data : town_land.h
- _train_view_desc : vehicle_gui.cpp
- _ttdp_version : saveload_internal.h , saveload.cpp , gamelog.cpp
- _use_palette : gfxinit.cpp , gfx_func.h
- _used_graphics_set : gfxinit.cpp
- _valid_tracks_on_leveled_foundation : rail_cmd.cpp
- _valid_tracks_without_foundation : rail_cmd.cpp
- _vehicle_command_translation_table : vehicle_gui.cpp
- _vehicle_details_desc : vehicle_gui.cpp
- _vehicle_details_widgets : vehicle_gui.cpp
- _vehicle_translation_table : vehicle_gui.cpp
- _vehicle_view_desc : vehicle_gui.cpp
- _vehicle_view_widgets : vehicle_gui.cpp
- _vehicle_view_zoom_levels : vehicle_gui.cpp
- _water_feature : newgrf_canal.h , newgrf_canal.cpp
- _water_percent : tgp.cpp
- _waypoint_count : rail_gui.cpp
- _year_engine_aging_stops : engine.cpp
- _z_back_window : window.cpp , window_gui.h
- _z_front_window : window.cpp , window_gui.h