How about this - http://bitsavers.trailing-edge.com/pdf/dec/vax/vms/5.0/AA-LA47A-TE_5.0_Guide _to_DECnet-VAX_Networking_Apr88.pdf It's for VMS users, but a) VMS is frankly the majority of the nodes, and b) many of the ideas are the same across all systems anyway. Bob