From: utzoo!decvax!cca!Peter@sri-unix Newsgroups: net.unix-wizards Title: A UNIX Question Article-I.D.: sri-unix.2151 Posted: Tue Jul 20 00:27:21 1982 Received: Sun Jul 25 00:49:42 1982 Date: 24 Jun 1982 1813-PDT Does any version of UNIX allow a process to initiate I/O on a physical device without blocking? For example, asynchronous disc I/O controlled by event flags, multiple processes with shared memory. Peter