A Centralized Directory
Enterprise-level applications use a lot of different directory services—lookup services that locate resources associated with a particular name. When you use RMI, for example, you locate objects with a directory service called the RMI Registry. When you use CORBA, you use the COS Naming facility (CORBA's naming service) to locate objects. When you convert a hostname to an IP address, you usually use a directory service called DNS (Domain Name Service). There are also general directory services that use protocols, such as X.500 (the CCITT directory standard) and LDAP (Lightweight Directory Access Protocol). These directory services can hold many kinds of data.
Although most people tend to use the terms "naming service" ...
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