How does, Do Not Import Duplicates, work?

Here's what I found in the user manual. (how about that, I read the manual before someone pointed it out to me)
Aperture checks the filename of the master to determine if an image is a duplicate of one in the library.
Aperture is checking the filename of the Master. So, if you always rename Masters, then this feature wouldn't actually do anything. Correct?
What if you are importing an image which happens to have the same filename. Perhaps you've reset your camera's naming feature. Or your importing from a different camera (probably same manufacturer) that happens to be a the point of overlapping, default names?
Does it actually check the entire Library? I wondered since the option is in the section where you are picking the Project to store them in. It makes me think it's only looking in one particular Project.
Either way, I'm not sure this is such a great feature. I'd rather have duplicates, as opposed to skipping files it thinks are duplicates.
What's the best way to utilize this feature?

The user manual says that Aperture checks the filename. I'm not exactly sure what that means.
I imported a couple of images. I changed both the Version and Master name. Then, I used the Batch Change command to change the time zone, so the times were different.
I then tried to re-import the same images. If I checked Do Not Import Duplicates, Aperture hid the images I just imported. If I unchecked it, I could import the images. I left it unchecked and imported the images.
I wound up with duplicates. Even though the Version name, File (Master) name and Date fields for both duplicates were different.
So the feature appears to work pretty good.
My issue is, since I don't know how it works, I'm not sure how to use it.
My concern is that if it's checked, Aperture hides duplicates, so you have to uncheck it to see what Aperture thinks are duplicates. It would be nice if Aperture showed the images it thought was duplicates, but had them grayed out with no way to check the import box.
It would be nice to know how this feature works. How does Aperture decide what makes an import you are about to import a duplicate, or not?

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    Message was edited by: Matt Leader

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