Specifies the operational state of the server module.  This parameter
 takes one of the following values:

     ON     The module is available for normal use.

     OFF    The module is not in use.

     SHUT   The module is to be closed down but only when all
            present activity has ceased. (The SHUT value applies only
            to the SET MODULE X25-SERVER or X29-SERVER command.)

            For the X25 server module, the default state is ON.  For
            the X29 server module, the default state is OFF.