POWEROFF enables or disables software requests to the console
    firmware to remove power from the system. This parameter should
    normally be turned ON (1)  to allow software to make power-off
    requests. However, POWEROFF can be set to OFF (0)  to disable
    software power-off requests.

    If firmware or hardware support for the power-off request is not
    implemented, the shut-down procedure will leave the system halted
    but fully powered.

    POWEROFF is a DYNAMIC parameter.