Give the trader the username and the password out of band; the password is never shown again (a hash is kept, not the password). A viewer logs in on the Autodesk page with the same Login link. What they can do: watch Autodesk (the state, the position, the charts, the triggers, the sheet, the week). What they cannot: Manual Mode, the archive, this page, or any change (Pause / Resume, orders, settings). Every such request answers 403 "view only", and the other pages send a viewer back to Autodesk.