The NCS$SAVE_CF routine, used in conjunction with the
    NCS$RESTORE_CF routine, permits the application program to
    store a conversion function definition in a local file or in
    a database. When the calling program specifies the conversion
    function identifier, NCS returns the location of the definition
    and its length in bytes, permitting the calling program to
    store the definition locally, rather than in an NCS library.
    Subsequently, the application supplies this information to the
    NCS$RESTORE_CF routine, which restores the conversion function to
    a form that can be used by the NCS$CONVERT routine.

    This routine also does some integrity checking on the conversion
    function as it is being processed.