One of the many things that have changed in ActionScript 3 has been the way that Flash handles depths, or the stacking order of objects on the stage. In ActionScript 2, there was a practically unlimited number of depths into which you could place an object. These depths determine what objects appear in front of other objects. An object with a depth of 100, for example, would cover up an object with a depth of 50. But in ActionScript 2, these depths didn’t have to be consecutive. In other words, if you only had 2 objects on the stage, you could very well set one of them to a depth of zero and set the other one to a depth of 1000.
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