How to add a meta-box to an admin page in WordPress

I’ve been developing a plug-in for Powet.TV to automate some background stuff that we do regularly.
One of the things I need to do is add a meta-box to the ‘edit post’ administration page. The below image is an example of a very simple meta-box. Its just a standard container for content in the administration panel.

This wasn’t as straight-forward as I expected it to be, or I should say, there weren’t any examples that were as straight-forward as I was hoping there would be. The best tutorial I found was located here. The problem with this tutorial was that it didn’t spell it out clearly enough for me. It was doing a few different things in the example and I just wanted a very simple meta-box without any functionality to start. My functionality was guaranteed to not match the functionality of the one in the example.

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