event-id

    OpenVMS usage identifier
    type          longword (unsigned)
    access        read only
    mechanism     by reference
    Identifier of the event. The optional event-id argument is the
    address of an unsigned longword containing the event identifier.

 event-name

    OpenVMS usage char_string
    type          character string
    access        read only
    mechanism     by descriptor
    Name of the event. The optional event-name argument is the
    address of a descriptor pointing to a character string containing
    the event name.