parameter-name

    Specifies the name of a parameter or a period (.).  A period is
    interpreted as a request for the parameter specified in the last
    PARAMETERS SET or PARAMETERS SHOW command. The parameter name
    can be abbreviated, but the abbreviation must be unique because
    SYSMAN selects the first parameter that matches.

    Beginning in OpenVMS Version 8.2, if the parameter-name that you
    enter is obsolete, SYSMAN displays OBSOLETE in the Units column.