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

    Serializes and deserializes boolean data.
    Format
      #include  <tcpip$rpcxdr.h>
      bool_t xdr_bool  (XDR *xdrs, bool_t *bp);

1 - Arguments

 xdrs
    A pointer to an XDR stream handle created by one of the XDR
    stream handle creation routines.
 bp
    A pointer to the boolean data.

2 - Description

    A filter primitive that translates between booleans (integers)
    and their external representations. When encoding data, this
    filter produces values of either one or zero.

3 - Return Values

    TRUE               Indicates success.
    FALSE              Indicates failure.