* Trying to understand this part better

* the OnExecutionUpdate method line 11 is setup with some argumentrs

? line 15, "execution.Order.OrderState", the part "execution", is this where it contains the last OnExecutionUpdate data ?
* execution seems is a var that carries all the last available execution-data

? Also wanted to know, from where is the data poured into the execution var ? Can you please explain that a bit.