A code-generating tool for creating programming skeletons that
    implement the RPC mechanism.

                                   NOTE

       RPCGEN runs the C preprocessor, CC/DECC/PREPROCESSOR, on
       all input files before actually interpreted the files.
       Therefore, all the preprocessor directives are legal within
       an RPCGEN input file. For each type of output file, RPCGEN
       defines a special preprocessor symbol for use by the RPCGEN
       programmer:

       RPC_HDR   Defined when compiling into header files.
       RPC_XDR   Defined when compiling into XDR routines.
       RPC_SVC   Defined when compiling into server skeletons.
       RPC_CLNT  Defined when compiling into client skeletons.
       RPC_TBL   Defined when compiling into RPC dispatch table.

       In addition, RPCGEN does a little preprocessing of its own.
       RPCGEN passes any line beginning with a percent sign (%)
       directly into the output file, without interpreting the
       line.

    Format