Access variable in MainTimeLine

I have preloader that loads another swf, game.swf.
// this code is in the preloader
var appRoot="localhost";
// load game
var request:URLRequest = new URLRequest("game.swf");
var _loader:Loader = new Loader();
_loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, onProgress);
_loader.contentLoaderInfo.addEventListener(Event.COMPLETE, onLoaded);
_loader.load(request);
How can I access preloader's variable from game.swf?
//this code in the game
var m:MovieClip = MovieClip(root);
trace ("m.appRoot=" + m.appRoot);
This gives error: m.appRoot=undefined..
Also "(root as MovieClip).appRoot" gives me the same error.
Why can't I have access to MainTimeLine's variables?

What I did:
I added one empty keyframe at the begining of the game.
The only code it has is 'stop();'.
So during loading it is stopped at the first frame.
When loading is COMPLETE (function onLoaded is called), game goes to frame 2 (named "start") with: movie.gotoAndStop("start");
Now, the code that works is:
var m:MovieClip = MovieClip(parent.parent);
if (m)
trace("m.appRoot=" + m.appRoot);
MovieClip(root) doesn't work.
I suppose this is a correct(?) way?

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