VMS Help TCPIP Services, Programming Interfaces, RPC XDR Routines, xdr_opaque  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Serializes and deserializes opaque structures.
    Format
      #include  <tcpip$rpcxdr.h>
      bool_t  xdr_opaque(XDR *xdrs, char *op, u_int cnt);

1 - Arguments

 xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream handle creation routines.
 op
    A pointer to the opaque data.
 cnt
    The size of op in bytes.

2 - Description

    A filter primitive that translates between fixed-size opaque data
    and its external representation. This routine treats the data
    as a fixed length of bytes and does not attempt to convert the
    bytes.

3 - Return Values

    TRUE               Indicates success.
    FALSE              Indicates failure.