VMS Help DECTPU, TPU$MESSAGE, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 string

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor
    Formatted message. The string argument is the address of
    a descriptor of text to be written. It must be completely
    formatted. This routine does not append the message prefixes.
    However, the text is appended to the message buffer if one
    exists. In addition, if the buffer is mapped to a window, the
    window is updated.