I'm moving to futures spreads, so I want to try to see how IB does spreads. Do you need to mail complete paperwork and funding to use the demo?
You do not need an account to run demo. Please read http://individuals.interactivebrokers.com/en/software/demoStandalone.php?ib_entity=llc . If you do not want to install TWS, run it from http://individuals.interactivebrokers.com/en/software/twsDisclaimer.php?ib_entity=llc and use same edemo/demouser credentials.