Noel wrote Yeah, ITS isn't user (spelled LUSER) friendly, but it sure is neat! In the past week I was just wondering if anyone has ever written an "MLDEV" handler for a non-ITS system. "MLDEV" was the virtual device that made other ITS systems look like devices (AI: MC: ML: DM:). When a device isn't recognized, ITS launches a new process (job) connected to the "superior" job (I think using a "JOBDEV" connection created using the JOB/BOJ pseudo-devices), running an executable named "@", which looks for an executable (in the DEVICE directory) that matches the user specified device, and runs it... There are "assigned numbers" for mit-ml-dev over UDP and TCP (ports 83 and 85)! I did find this: http://victor.se/bjorn/its/ch11.php Which simulates the CH11 (unibus) Chaosnet interface (presumably for the KS10 simulation) under KLH10 and encapsulates chaosnet traffic in UDP. And mentions the magic file names involved!