How Out of Stock Module Works

Hey All,

I've just added the out of stock module and I'm not sure exactly how it works. The link: http://drupal.org/project/modules?text=uc_multi_stock. I haven't been able to find any documentation on how it functions. I'm sure it has something to do with the attributes you're able to add to each individual product. If anyone can elaborate on this I would be much appreciative.
Thanks in advance.

regards