I have come into a Teleplex box that IIRC, is used to allow time sharing onto a main-frame by several terminals... I never quite understood how this worked. I mean, how did the main-frame know to suspend the current operation and resume a previous with the use of these old multiplexors. FOND MEMORY: I remember that back in 1982, my TRS-80 Model II had a multiplexor option available to allow it to have multiple users. What can I use this thing for? A ---------------------------------------- Tired of Micro$oft??? Move up to a REAL OS... ######__ __ ____ __ __ _ __ # #####/ / / / / __ | / / / / | |/ /## ####/ / / / / / / / / / / / | /### ###/ /__ / / / / / / / /_/ / / |#### ##/____/ /_/ /_/ /_/ /_____/ /_/|_|#### # ###### ("LINUX" for those of you without fixed-width fonts) ---------------------------------------- Be a Slacker! http://www.slackware.com Slackware Mailing List: http://www.digitalslackers.net/linux/list.html