Debian apt question

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Autor: newbie
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Assunto: Debian apt question
I am interested in finding out exactley how apt keeps track of dependencies.
How does it know what packages need what? Where can I find that information?
I've read just about everything on the debain site, but can't find any
specific docs pertainging to indepth knowledge of how apt works.

Do I need to just download the source and view it? Or does someone know of a
white paper or something?

Joe