MULTINET
  Programming
    Socket_Library_Functions
      socket_option_TCP_NODELAY

         Disables the Nagle algorithm (RFC 896) which causes TCP to
         have, at most, one outstanding unacknowledged small segment. By
         default, the Nagle algorithm is enabled, delaying small segments
         of output data up to 200 ms so that they can be packaged into
         larger segments. If you enable TCP_NODELAY, TCP sends small
         segments as soon as possible, without waiting for acknowledgments
         from the receiver or for the 200 ms TCP fast timer to expire.

         Format

           Status = setsockopt(VMS_Channel, IPPROTO_TCP, TCP_NODELAY, On,
                           sizeof(*On));

           unsigned int *On;