Quote from solotrade:
As far as I know, OCO orders for live trading reside at the Ninja server, not on my local computer.
I may be wrong; need somebody to confirm it.
I occasionally turn off the trading platform if I walk away for a short while.
I can still see the target and stop-loss on the DOM until either of them is hit, and the other order automatically being cancelled.
No. Your orders don't go to "Ninja server" lol You're using Zenfire.
You can't confirm it for yourself?
http://lmgtfy.com/?q=ninjatrader+oco+simulated