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We consider the analysis of infinite half-duplex systems which consists of finite state machines thatcommunicate over unbounded channels. The property half-duplex for two machines and two channels(one in each direction) says that each reachable state has at least one channel empty.The contributions of this paper are (a) to give a finite description of the reachability set of such systems,which happens to be effectively recognizable; this description allows us to solve classical...

Programs with quasi-stable channels are effectively recognizable