DECnet on VMS
From Computer History Wiki
Setting up DECnet phase IV on VMS is a fairly straightforward procedure.
Note: Before setting up any system I recommend you read up on DECnet Phase IV basics.
Note: This procedure requires DECnet to already be installed. On modern versions of VMS (From what version on? 6.x? 7.x?), DECnet is bundled with VMS, but this cannot be taken for granted. This also makes the assumption that DECnet phase V is enabled, something which most VMS installations after 7.x will default to.
To invoke the interactive DECnet configuration script, run (as SYSTEM or as a user with sufficient privileges):
$ SET DEF SYS$MANAGER $ @NETCONFIG
The DCL script will guide you through setting up your system with DECnet.