Yes, if "Tick-level simulation" is enabled in the trading system properties
, then RightEdge will use tick data if it is present in your data store. Of course, this can mean it runs more slowly since there's a lot more data to process.
Without tick data, RightEdge will break each input bar up into ticks based on the open, low, high, and close values. If the input bars are of a higher frequency than your trading system is operating on (ie you are using 1 minute bars for your bar data but your system runs on 15 minute bars), then this will help capture the price movement inside the bars.
Also, RightEdge doesn't assume that the OHLC prices are the only prices that were traded. It generally assumes the price moved smoothly between them, so if you have a limit or stop order between two of the prices, and the trading price moves from a price that doesn't fulfill the order to one that does, the order will be filled at the limit or the stop price rather than the exact OHLC price.