condition-value
    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    OpenVMS 32-bit condition value. The condition-value argument is
    an unsigned longword that contains this condition value.
    The HP OpenVMS Programming Concepts Manual explains the format of
    an OpenVMS condition value.
 condition-argument
    OpenVMS usage:varying_arg
    type:         unspecified
    access:       read only
    mechanism:    by value
    As many arguments as are required to process the exception
    specified by condition-value. Note that these arguments are
    also used as FAO (formatted ASCII output) arguments to format
    a message.
    The HP OpenVMS Programming Concepts Manual explains the message
    format.
 condition-value-n
    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value
    OpenVMS 32-bit condition value. The optional condition-value-n
    argument is an unsigned longword that contains this condition
    value. The calling routine can specify additional conditions to
    be processed by specifying condition-value-2 through condition-
    value-n, with each condition value followed by any arguments
    required to process the condition specified. However, the total
    number of arguments in the call to LIB$SIGNAL must not exceed
    253.
    The HP OpenVMS Programming Concepts Manual explains the format of
    an OpenVMS condition value.
 condition-argument-n
    OpenVMS usage:varying_arg
    type:         unspecified
    access:       read only
    mechanism:    by value
    As many arguments as are required to create the message reporting
    the exception specified by condition-value-n.
    The HP OpenVMS Programming Concepts Manual explains the message
    format.