The Simulated Data Feed Connection is a default connection installed with NinjaTrader. It's purpose is to play internally generated market data for simulation. This connection can be used for:
For the simulated data feed you must provide a starting price for any instrument you wish to initiate an internally generated simulated feed. Via the Control Center window, Tools-->Instrument Manager, find the instrument you wish to simulate data for, select it, press the "Edit" button and set the "Sim feed start price" value as per the image below.
** This connection is a random internally generated market and has NO correlation to real market data **
Once you are connected to the Simulated Data Feed Connection, you can control the trend of the data feed using the "Trend" slider control.