My 2.9bsd system has a t_iproc as well as t_oproc for routines to start for input and output. My 4.2/3 system doesn't have t_iproc. What happened to it? What is its history? Thanks, -tcs Terry Slattery U.S. Naval Academy 301-267-4413 ARPA: tcs at brl-bmd UUCP: decvax!brl-bmd!usna!tcs