You can install DECnet-Plus for OpenVMS software on your system
in either of the following ways:
From the OpenVMS installation procedure
menu, as part of the operating system upgrade or installation
As a layered application using the DCL command PRODUCT
INSTALL
Once the DECnet-Plus software is installed successfully, you
invoke a menu-based configuration procedure to configure the software
according to the unique characteristics of your system and network:
Use the Fast configuration option
if you are upgrading from a DECnet Phase IV node, you plan to use
the existing Phase IV configuration, and your node is not part of
an OpenVMS Cluster. Enter:
$ @SYS$MANAGER:NET$CONFIGURE
Use the Basic configuration option if your node
is in a cluster, you are upgrading or reconfiguring DECnet-Plus,
and you want to run DECnet over TCP/IP. Enter:
$ @SYS$MANAGER:NET$CONFIGURE BASIC
Use the Advanced configuration option if your node's
configuration is complex and you need to customize it. Enter:
$ @SYS$MANAGER:NET$CONFIGURE ADVANCED
For detailed installation and configuration information, refer
to the DECnet-Plus for OpenVMS Installation and Basic Configuration manual.
HP OpenVMS System Manager's Manual, Volume 2:... 
Network Considerations
