Hacking usb loader gx + 2 gamecube disc?

[element73]

I read a couple posts. I understand that for games that require 2 disc (for example, tale of symphonia) you place the second iso, labeled disc2.iso, inside the same folder where game.iso is located. I wanted to know how this works? I read it is automatic, but I can't find out what they mean by that. Do I just try to load up tales of symphonia and it will automatically run game.iso, then as I progress far enough it will automatially run disc2.iso ? Is that how it automatically works? Please someone clarify.