the command command_name is not available

    Facility: DEBUG, VMS Debugger

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

    User Action: Choose another command.