I wasn't able to find anything about this in a search, so figured I'd ask here.
What are the rules or regulations, if any, of trading futures on someone else's account? Say for example I have a friend who'd like to open a brokerage account but have me do the trading for him -- is that legal? Do I need to be licensed, does the broker need additional paperwork, etc.? Or can he just provide me with the log in info and I can execute trades on his behalf?