This is a debugging tool. This mod tracks and shows you what event ID(defines.events.～) occurs. Only admins can open GUI if it is multiplay game. - Press SHIFT+F3 to open GUI. (you can change key bindings) - Press SHIFT+F2 for quick toggle logging mode while GUI is opened. - Only works while GUI is opened. Tracked logs can be saved and investigated by "gvv" mod. https://mods.factorio.com/mod/gvv Visit https://lua-api.factorio.com/latest/events.html to see full description of events.