With help and a pointer from Peter, we ve set up the DECnet over Multinet link between LEGATO and STUPI to use TCP instead of UDP. It seems to work fine whether it s better than the UDP version only time will tell. It turns out that none of this is magic it s all pretty well documented by Process Software. Just type HELP MULTINET SET /DECNET and you ll see the /TCP qualifier. There s also a /FILTER_OUT_OF_ORDER qualifier which forces the driver to drop out of order UDP packets. Of course, that doesn t apply to TCP, but it does remove that objection to the UDP implementation. Bob