VMS Help DECTPU, FILEIO, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 code

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Item code specifying a DECTPU function. The code argument is the
    address of a longword containing an item code from DECTPU, which
    specifies a function to perform.

 stream

    OpenVMS usage:unspecified
    type:         longword (unsigned)
    access:       modify
    mechanism:    by reference
    File description. The stream argument is the address of a data
    structure containing four longwords. This data structure is used
    to describe the file to be manipulated.

 data

    OpenVMS usage:item_list_3
    type:         longword (unsigned)
    access:       modify
    mechanism:    by reference
    Stream data. The data argument is either the address of an item
    list or the address of a descriptor.

                                   NOTE

       The value of this parameter depends on which item code you
       specify.