What is the difference between document class and normal class

Hi,
Please let me know what is the difference between document class and normal class.
And I have no idea which class should call as document class or call as an object.
Thanks
-Actionscript Developer

the document class is invoked immediately when your swf opens.  the document class must subclass the sprite or movieclip class.
all other classes are invoked explicitly with code and need not subclass any other class.

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