Z/OS 2.2 also provides SMC-D, which I am eager to get a chance to play with. All the convenience and familiarity of sockets, but with most of the TCP/IP overhead stripped out (since the underlying transport layer is reliable). It should have significantly better performance and less CPU consumption than hipersockets. Information here: https://www-01.ibm.com/software/network/commserver/SMC-D/index.html
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