"This document describes domain-name-based service principal names and the corresponding name type for the Generic Security Service Application Programming Interface (GSS-API). Internationalization of the GSS-API is also covered. Domain-based service names are similar to host-based service names@ but using a domain name (not necessarily an Internet domain name) in addition to a hostname. The primary purpose of domain-based names is to provide a measure of protection to applications that utilize insecure service discovery protocols. This is achieved by providing a way to name clustered services after the ""domain"" which they service@ thereby allowing their clients to authorize the service's servers based on authentication of their service names."