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The server administrator controls which local services are available for remote execution by adding and removing services from the REXEC database /etc/rexec/services.
Although REXEC is installed with three standard services defined, these services can be removed from the REXEC database at any time. In addition, the server administrator can add other services to the database and make them available to clients for remote execution.
You don't need to edit /etc/rexec/services explicitly; instead, the rxservice command is provided as an interface to the file. rxservice allows a privileged user to add and remove services from the REXEC database.