What does Delete Computer Accounts permission do?

Greetings,

   We have an OU with computer accounts in it.

   I gave someone the following permissions on that OU:

Permission: Delete Computer Accounts

Applies To: This object and descendant computer objects

  With these permissions they CANNOT delete computer accounts within that OU.

So I gave them the following permissions:

Permission: Delete

Applies To: Descendant computer objects

This works!

Which begs the question - what does the Delete Computer account permission allow you to do exactly? Cause it certainly doesnt allow you to delete computer accounts!

Thanks

David Z