Hello, I'm helping migrate some code from MPE to HPUX which uses FDEVICECONTROL. At some point there's a call to this intrinsic with the parameters 192, 32 with a NUL character in the buffer. The manual says this "Read trigger and block mode trigger character: Specify which character the DTC should send to trigger a character mode or block mode read on a device. The standard trigger character is DC1. If a NUL character is specified, there is no trigger character." In UNIX terms, does this just mean that the particular call (with NUL) is turning off flow control? I'm guessing since DC1 is a flow control character. Thanks. Peter -- http://www.beluga.freeserve.co.uk * To join/leave the list, search archives, change list settings, * * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *