Questions about strategy tester

[[Deleted]]

What is the way used by the tester to emulate price ticks?

I've downloaded prices data from the history center; "modeling quality" is shown as 90% for M5 period, and only 25% for M1 period. Why?

Is it possible to visualize backtest orders on the candlestick graph?

Why results of backtesting runs can be different, although they were executed with the same EA and the same parameters?

Thanks in advance.

[zzuegg]

http://tinyurl.com/677st3h