/sys$common/syshlp/helplib.hlb RMS, $EXTEND  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The Extend service increases the amount of space allocated to
    a disk file. This service is most useful for extending relative
    files and indexed files when you are doing block I/O transfers
    using the Write service.

    Format

      SYS$EXTEND  fab [,[err] [,suc]]

  Additional Information (explode) :

• Returns
• Arguments
• Condition Values Returned