HELP: _root or _parent, targetting external SWFs with it

Hello there,

Supposing you have 3 levels of “loadMovieNum”. Example: “This” is my main stage, and then on a certain frame, i loaded an external file at “LEVEL 1” , then next frame at “LEVEL 2” and last “LEVEL 3”.
Will the "_root.container.MC.gotoAndPlay(“lable”); still work? Supposing im trying to target an MC in LEVEL 2? Will the _root and _parent work seemslessly?

I hope I have explained it well…

Thanks