The LAT Control Program (LATCP) utility
configures and controls the LAT software on OpenVMS systems. LATCP
commands let you stop and start the LAT driver (which implements
the LAT protocol) and modify or display LAT characteristics of the
OpenVMS node.
With LATCP, you can set up your system as a service node,
which offers one or more resources (services) for access by users
on other systems in the local area network (LAN).
You can also use LATCP to set up the system to allow its users
to access services on other systems in the LAN. In this case, the
system can act like a terminal server: it can manage multiple user
sessions simultaneously for connections to services on other nodes.
You can use LATCP to set up your system to support incoming
access only, outgoing access only, or both incoming and outgoing
access. You can also
set up your system so that it supports neither incoming nor outgoing
access.
When you set up your system to support outgoing access, the
LAT software manages a database of LAT services and nodes. The software
builds the database when
you enable outgoing access on your node. The software begins to
collect LAT service announcements--multicast
messages sent by LAT service nodes--and builds the database
based on these service announcements. You can use LATCP
to display the services and nodes in this database and to control
the size of the database. Allow outgoing access on systems that
can tolerate the additional overhead, such as standalone systems.
Use LATCP to perform the following actions:
Specify operational characteristics
for your node and its services
Turn the state of the LAT port driver (LTDRIVER)
on and off
Display the status of LAT services and service nodes
in the network
Display the status of links created on your LAT
node
Display the status of your LAT node
Show and zero LAT counters
Create, delete, and manage LAT ports
Recall previously entered LATCP commands so that
you can execute them again without having to reenter them
Create subprocesses so that you can execute DCL
commands without exiting from LATCP
With the LAT protocol, you can set up LAT application ports
on the local node so that users can access printers and other asynchronous
devices that are connected to LAT terminal servers or service nodes
on the LAN. The remote devices must be configured appropriately.
for information about configuring remote devices on a LAT system.)
Invoking and Exiting LATCP Enter the following command to invoke LATCP:
$ RUN SYS$SYSTEM:LATCPLATCP>
At the LATCP> prompt, you can enter LATCP commands.
To exit LATCP, enter EXIT or press Ctrl/Z at the LATCP> prompt.
You can also execute a single LATCP command by using a DCL
string assignment statement, as shown in the following example:
$ LCP :== $LATCP$ LCP SET NODE/STATE=ON
LATCP executes the SET NODE command and returns control to
DCL.
LATCP Commands LATCP Commands summarizes the
LATCP commands.
Table 1 LATCP Commands
Command
Function
ATTACH
Transfers control from your
current process to the specified process.
CREATE LINK
Creates LAT data links.
CREATE PORT
Creates a logical port on
the local node.
CREATE SERVICE
Creates a service on a service
node.
DEFINE/KEY
Assigns a command string
to a function key on your keypad.
DELETE LINK
Deletes a LAT data link
from a node.
DELETE PORT
Deletes an application port
or dedicated port.
DELETE QUEUE_ENTRY
Deletes an incoming queued
request from the local node.
DELETE SERVICE
Deletes a service on a service
node.
EXIT
Returns the user to DCL
command level.
HELP
Displays help text for LATCP
commands.
RECALL
Recalls LATCP commands that
you entered previously so that you can execute them again.
REFRESH
Refreshes your display screen,
for example, after your display has been overwritten by output from
some other source.
SCROLL
Allows you to retrieve information
that has scrolled off the screen.
SET LINK
Modifies characteristics
of LAT data links.
SET NODE
Specifies LAT characteristics
for a node.
SET PORT
Maps a logical port on a
node to either a remote device on a terminal server or a special
application service on a remote LAT service node.
SET SERVICE
Changes service characteristics.
SHOW LINK
Displays the characteristics
of links on your node.
SHOW NODE
Displays the characteristics
of nodes.
SHOW PORT
Displays port characteristics.
SHOW QUEUE_ENTRY
Displays information about
requests, or entries, queued on the local node.
SHOW SERVICE
Displays characteristics
of LAT services known to your node.
SPAWN
Creates a subprocess.
ZERO COUNTERS
Resets the node counters, service counters,
and link counters maintained by your node.
For detailed information about LATCP commands and qualifiers,
refer to the HP OpenVMS System Management Utilities Reference Manual.
HP OpenVMS System Manager's Manual, Volume 2:... 
Managing the LAT Software
