Execute the appropriate management procedure for the specified directory
 service.

     MANAGE [DIRECTORY_SERVICE dir-service]

 The management procedures only provides management of those aspects of
 the directory service that affect how node names are stored and used.
 They do not provide general management of the directory service.  The
 specific management functions provided depend on the directory service.

 The management procedure is executed as a child process, and control
 returns to DECNET_REGISTER when the execution is complete.