Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, PRMNOTAVAIL  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 the command parameter parameter_name is not available

    Facility: DEBUG, VMS Debugger

    Explanation: The specified command parameter, although available
    in some debug implementations, is not available in this one.
    One reason why is that the parameter just doesn't make sense
    on the platform. For example, the JSB parameter on a SET STEP
    command doesn't make sense on Alpha VMS because there is no "JSB"
    instruction like there is on VAX VMS.

    User Action: Reissue the command without the parameter.