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pnameslist is in fact just an argument to themultidepend()statement on the next line - this is the one which implements the priorities. The mechanism behind this is that wheneth1comes up wheneth0is already up, it executedmultiprovide("NET-eth1");, becauseNET-eth1is in front ofNET-eth0,multidepend()will go down and come back up immediately, but exposing variables from theeth1process instead ofeth0.