As long as you actually have an IB acct (and have setup the Connection using
your IB credentials) you can tell NinjaTrader to use the data feed from your NTB
account (which means you can completely ignore IB's data feed) and make trades
in both your NTB and IB accounts using only one data feed, such as the free data
provided by your NTB account.
Regarding IB and data feed connections, more good reading here.
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