input

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor
    Input file name. The input argument is the address for a
    descriptor of a file specification.

 output

    OpenVMS usage:char_string
    type:         character string
    access:       read only
    mechanism:    by descriptor
    Output file name. The output argument is the address for a
    descriptor of an output file specification. It is used with the
    /OUTPUT command qualifier.