Any individually manageable piece of CDS is called an entity.  A
   set of commands exists for each entity. The following is a list of
   the entities and a description of what each entity represents:

   Cached Clearinghouse
             A cached clearinghouse is a clearinghouse that a clerk
             has discovered and cached.  A clerk can learn about
             clearinghouses as a result of configuration information,
             advertisements received on a LAN, or during the process
             of finding a name.

   Cached Server
             A cached server is a server that a clerk has cached as
             a result of manual configuration through the control
             program.

   Child     A child pointer connects a parent and child directory in
             a hierarchical namespace. The child pointer is stored in
             the parent directory and has the same name as the child
             directory.

   Clearinghouse
             A clearinghouse is a database containing a collection of
             directory replicas at a particular server.

   Clerk     The clerk is the interface between client applications
             and servers.

   Directory
             A directory contains child,object and link entries that
             are logically stored under one name
             (the directory name).

   Link      A soft link is a pointer providing an alternate name for
             an object entry, directory, or other soft link.

   Object    An object entry represents a resource (for example, an
             application) that is named in the namespace.

   Replica   A replica is a copy of a directory. Each copy, including
             the original or master, is referred to as a replica.

   Server    A server handles lookup requests from clerks and
             maintains the contents of the clearinghouse or
             clearinghouses at its node.