The Intra-Cluster Communications Reply and Wait service transmits
    a single message over a connection in response to a $ICC_
    TRANSCEIVE[W] request.

    The $ICC_REPLYW service completes synchronously; that is, it
    returns to the caller when the underlying transport layer has
    released use of the reply buffer.

    For asynchronous completion, use the $ICC_REPLY service; $ICC_
    REPLY returns to the caller as soon as the transmission request
    has been queued to the transport layer, without waiting for
    notification that the transport layer has released control of
    the data buffer.

    On Alpha and Integrity server systems, this service accepts 64-
    bit addresses.

    Format

      SYS$ICC_REPLYW  conn_handle, ios_icc, [astadr], [astprm],

                      reply_buf, reply_len

    C Prototype

      sys$icc_replyw  (unsigned int conn_handle, struct _ios_icc

                      *ios_icc, void (*astadr)(__unknown_params),

                      __int64 astprm, char *reply_buf, unsigned int

                      reply_len);