Norton Account and Computers' Installs

How do our Norton Account (through manage.norton.com) and our individual computers know which computer has which installation?  We can use all of our allowed installs for a product, and then uninstall one of them, and then something must change in our Norton account.  Would we need to have a way to USE the Norton account to remove an install from a chosen computer?  

I do not understand this.  I only understand, (1) Install the product, (2) The Norton Account takes the information and records the install.  TEACH WHAT TO DO AND HOW TO UNDERSTAND!