Top Level Scopes
Basically there are two main top level scopes. These are the _global object and the current _level or _root. These exist on their own without really existing within any other scope. Virtually anything else, however, will reside in one of these two scopes or at least within some hierarchy within it.

The _level scope is really where everything pretty much starts. In your main movie this is also known as _root. This is the core movieclip object in which the Flash movie exists. And yes, it is a movieclip, just like any movieclip you would make otherwise. The only difference is that this movieclip needs to exist if your movie is to exist. Subsequent movieclips can be placed within the _root movieclip and further movieclips in those, etc. It is also common to begin actionscripting in the _root timeline.

The _global object is a container for Actionscript objects and functions. Its where much of that script you write comes from. Because the _global object is accessible everywhere, it gives you access to that core Actionscript functionality that is needed to run your movie - in any movieclip, in any scope.

[ top level scopes in a Flash movie ]

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