HP OpenVMS System Manager's Manual, Volume 2:... |
Managing the LAT Software |
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Understanding the LAT Protocol
With the LAT software, which implements the LAT protocol, the operating system can offer resources, or services, that the terminal servers can access. A system that offers LAT services is called a service node. In addition, nodes can access LAT services by enabling outgoing connections (using LATCP) and using the DCL command SET HOST/LAT. (In the remainder of this chapter, "servers" refers both to dedicated terminal servers and to nodes that allow outgoing access to other LAT services.)
A LAT service can consist of all the resources of a computer system, or it can be a specific resource on a computer system, such as an application program. You can set up your system as a general timesharing service, meaning that all of its resources are available to users in the LAN, or you can restrict access to a specific service (application program) on the system. This chapter and the HP OpenVMS I/O User's Reference Manual outline the procedure you use to set up access to a dedicated application program.
How the LAT Protocol Works ![]()
The LAT protocol allows the terminal servers and computers
to communicate within a LAN, such as the Ethernet or the Fiber Distributed
Data Interconnect (FDDI). The LAT protocol matches terminals and
other devices to the computing resources (services) of the LAN.
Because LAT terminals are not connected directly to the computer
(service node) they are accessing, the local server must listen
for service requests from its terminals and be able to match the
terminals with computers that provide the desired services.
Using the LAT protocol, then, the operating system announces its available services over the LAN. Servers listen to the LAN announcements and build a database of service information so that they can locate an appropriate system when a user terminal requests computing services. For example, a user terminal might request general processing service or a data entry program on the operating system. A server uses the LAT protocol to establish and maintain a connection between the requesting terminal and the operating system.
Sometimes the operating system can request services from a terminal server. The LAT protocol allows systems to ask for connections to printers or other devices attached to a terminal server.
Advantages of the LAT Protocol ![]()
Using the
LAT protocol on your system has many advantages:
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