In previous versions of the Sun RPC library, you used the clnt_call() function to send a remote procedure call. With the extended one-way messaging service, the clnt_send() function sends one-way remote procedure calls.
When the client calls clnt_send(), the client sends a request to the server and continues processing. When the request arrives at the server, the server calls a dispatch routine to process the incoming request.
If you do not provide the correct version number to clnt_create(), clnt_call() fails. In the same circumstances, clnt_send() does not report the failure, as the server does not return a status.