$post is actually used all over the place. If you're looking for something more specific, someone might be able to help you. Generally, the route to take when starting on a hack is to enable template names in comments to find the template containing what you want to change, do a find in files for the template name to find the file responsible, then look for a hook in that file that you can use to change what needs changing. You can then make a plugin for that hook that has the code to place there.
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