WordPress MU

How do you identify which "labeled" category corresponds to a numerical value?

I have a theme that likes to identify Categories with numeric values and at the moment it's more like guessing... any clue?

Thanks

Go to the category listing page in admin. Hover over the category link and in the bottom of the browser it'll show the ID in the string.

Many themes that use these IDs also show how to find them in their readme somewhere.