Problem with children in flash

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Flash

AS3

Hello guys. For the past few weeks now i have started to experement with the children functions in flash. I am able to add them to the screen and push them into a array. What i am asking you guys is how do i access each child indiviually, for instance:

for ever _bullet check if it intersects with a object BUT actuall refernce it like a regular class like any other class in actionscript3. I have heard you can do this with something called _root but thats all i know, nothing more. I have tried searching for this without ANY luck of help so thats why i came here :| thanks for the help guys.