A designated server running Microsoft Windows NT or Windows 2000 in an enterprise, which is used as a central repository for software licensing information regarding Windows NT, Windows 2000, or Microsoft BackOffice.
An enterprise server is typically a primary domain controller (PDC) but can also be a stand-alone server that is not part of any domain in the enterprise.
All PDCs in the enterprise replicate their licensing information with the enterprise server, so the enterprise server contains a master database of this information.
If there is only one domain in the enterprise, the PDC for that domain is the master licensing server. If there are several domains, each domain’s PDC keeps track of licenses for that domain, and all PDCs then replicate their licensing information to the specifically designated enterprise server.
Stand-alone member servers that are not part of any domain also need to replicate their licensing information with the enterprise server.
You can have more than one enterprise server in your enterprise, but it is simplest to have only one because enterprise servers cannot replicate with each other.