You can run the LANACP LAN server process to provide the following
services:
Maintenance of the LAN volatile node
database
Maintenance of the LAN volatile device database
MOP downline load
The LANCP utility allows you to issue instructions to the
LANACP process.
Three principal files are connected with LANACP:
SYS$SYSTEM:LANACP.EXE This file is the LANACP utility program.
SYS$STARTUP:LAN$STARTUP.COM This file starts the LANACP server process.
SYS$STARTUP:VMS$DEVICE_STARTUP.COM This file contains an entry that is used to start LANACP automatically
at system startup.
In addition, four system logical names, described in
LANACP System Logical Names, are associated with the
LANACP LAN server process.
Table 3 LANACP System Logical Names
Component
Description
LAN$DLL
Defines the location of
downline load files, where the location of the file is not provided
in the load request or explicitly defined in the LAN volatile node
database. By default, this is defined as SYS$SYSROOT:[MOM$SYSTEM].
LAN$NODE_DATABASE
Defines the location of
the LAN permanent node database. By default, this is defined as SYS$COMMON:[SYSEXE]LAN$NODE_DATABASE.DAT.
LAN$DEVICE_DATABASE
Defines the location of
the LAN permanent device database. By default, this is defined as SYS$SPECIFIC:[SYSEXE]LAN$DEVICE_DATABASE.DAT.
LAN$ACP
Defines the location of the LANACP LAN
server process log file, containing entries describing changes to
the LAN permanent device and node databases, and load request and
load status information. By default, this is defined as SYS$MANAGER:LAN$ACP.LOG.
Running the LANACP LAN Server Process To start the LANACP LAN server process, type @SYS$STARTUP:LAN$STARTUP
at the DCL prompt.
Stopping the LANACP LAN Server Process To stop the LANACP LAN server process, enter the SET ACP/STOP
command at the LANCP utility prompt.
HP OpenVMS System Manager's Manual, Volume 2:... 
Managing the Local Area Network (LAN) Software
