Forex FLEX EA, how does virtual trading work?

We've been using this EA for sometime now, and we are trying to figure out exactly how the virtual trading feature works so we can also implement it into our own strategy. 

Here is the website : https://forexflexea.com/

Maybe you are already familiar with this EA since it seems to be relatively popular. 

Otherwise we have bought the EA and have our own copy. 

I'm not sure if this is possible, but maybe you can decompile the EA and look at the code to see exactly how it works?

Or is there any other way to see exactly how it works?

We are willing to pay for this knowledge. Budget is negotiable.