OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    Longword value returned as a status code. It is generally a
    success code. If the XLATE routine cannot process the passed
    string for some reason, it sets status to an error code.
    Returning an error code from the XLATE routine aborts the current
    key execution and displays the appropriate error message.

    The condition value is returned in R0.