On Fri, 17 May 2013 06:49:40 -0700, you wrote: DECnet (NCP) has a TRIGGER command that sends a special MOP message to a remote machine, and that's supposed to force the machine to do a hard reset and the reboot, presumably via DECnet. It uses MOP, not DECnet. Although MOP is described among other DECnet standards and managed with NCP, it does not use DECnet protocols to do its thing. IIRC it does not even use NETDRIVER & Co. but its own NDDRIVER. :) The problem is that it doesn't seem like there are many PDP-11 or VAX communications interfaces that actually implement this. The DMR and DMC appear to, but as far as I can find those are the only ones. In particular there don't appear to be any QBUS interfaces that can do it. Have I missed any? Has anybody ever done this? What interface did you use? Years ago I made some experiments with CONNECT (and TRIGGER) and a DEC 3000 Alpha workstation. It worked (somewhat), but only if the host was waiting at the >>> prompt. If that was the case, it was possibile to connect to the SRM, type commands and receive responses. I do not remember if TRIGGER would start the boot process or if it did not work. I had the overall feeling that the DEC 3000 firmware code managing those functions was not very well tested and debugged as it locked the whole machine quite often... HTH, :) G.