About History Center of MT4

 

In my thesis i need real gold data . So i downloaded it from MT4 's history.

But i dont know reliability of them.

Can i know where history center store?

i mean why 2 brokers at the same time can be different from each other? they also load from Metaquotes's databases ?

what different and similar of 2 brokers at the same time?

Plz explain for me to understand :)


thanks so much