It is for the stuff you normally print, but want to actually see in-game: FPS, current state, what part you are standing on, what a raycast hit, how long something took, memory, script activity, or ...

That the entity of a UI Script is stored in sys_ui_script as 'one script = one record', and the content is client-side JavaScript that runs in the browser That sys_ui_script is metadata-based, ...

Launch an application to debug Attach to running applications and debug them Set breakpoints and step through code Inspect the state of the application The arrow keys are good candidates for keymaps ...