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We propose and evaluate two complementary techniques to protect and virtualize a tightly-coupled network interface in a multicomputer. The techniques allow efficient, direct application access to network hardware in a multiprogrammed environment while gaining most of the benefits of a memory-based network interface. First, two-case delivery allows an application to receive a message directly from the network hardware in ordinary circumstances, but provides buffering transparently when requireddoi:10.1109/hpca.1998.650562 dblp:conf/hpca/MackenzieKFLLAK98 fatcat:cdsykxvxuncavifo2mrkug2nr4