No, we cannot. The indicator uses the data series provided to it from the strategy.
You can "delay" the signals by using "shift" as in Moving Average:

 protected double[] MovingAverage(int period, int shift, MAMethod maMethod, double[] source)

But the shift cannot be negative. This limitation is done to provide equal behaviour in the tests and in the trading. Obviously we cannot see an indicator form the future in live trading, so we have not to use it for backtesting.

You can safely pretend that all calculations are executed on "tick" data. Actually there is no such thing, but the backtetsing engine cleverly puts a tick at the point of the execution. It is more "ticky" than the MetaTrader's "every tick" mode.

Thanks for all the help Mr Popov, does that just mean whether long trade and short trades are allowed or is that the actual signal to buy/sell? I don't see anything else that looks like a buy/sell signal.

also I take it we cannot reference the ask or bid price separately, I assume it's always the ask price?

ok, i finally figured out what my problem is. You say Bars-1 is the current bar, but that really means the last bar in the series.  I need to backtest my indicator and i need bar to equal the bar it's currently testing. Using bar-1 just means the very last bar, so the back test doesn't show anything.  So let me re-phrase my question, what variable is the current bar the backtester is working on.  Does that make sense?  thanks!

EDIT - ok I think I understand now. I'm so used to metatrader and trading station coding/backtesting.

I see since the data set is loaded in advance, I need to create my own loop to represent the current bar,
as in for (int bar = 0;bar < Bars; bar++)
then bar is the current bar for the calculations.

awesome thanks Mr Popov, that's exactly the information I was looking for!
by the way, I have to say I'm very impressed with what you have created.
You basically not only created your own strategy tester/builder but also pretty much your own language
My only concern continues to be the chance for differences between the .cs indicator and the .mq5 one that needs to be created separately.  I'm not sure if you downloaded the 2 indicators I created. I'm still not 100% confident that my mql code is working exactly like my .cs code.   I still see cases where sometimes when I backtest in MT5 the results look similar, and yet sometimes they are totally different.  It will show a great equity curve in FSB but then it will lose in MT5.
Do you know what may cause that discrepancy other than the mq5 code not matching the .cs?
Thanks again and have a good day,
Jim

well thank you for at least looking and trying to help

I haven't seen Footon recently, in fact it doesn't seem there have been any new indicators in quite awhile.