- Hewlett-Packard Printer User Guide

Using the VPO Application Programming Interfaces
The VPO Interfaces
Chapter 4178
Overview of the Agent Message Stream Interface
The Agent Message Stream Interface allows you to tap the message
flow of a VPO managed node to enable additional message processing by
external applications before a message is sent to the management server.
This can help to reduce the amount of network traffic considerably. A
typical external application might be an event correlation engine, for
example ECS.
Overview of the Legacy Link Interface
The Legacy Link Interface enables you to manage network nodes for
which VPO intelligent agent software is not available, such as legacy
mainframe systems.
This API provides an interface to a process running on the management
server node. This process can send (write) messages, receive action
requests, and send action responses. It must handle all communication
with the network node that lacks the intelligent agent, and it must
ensure that the messages sent to the management server are correct and
complete.
A Legacy Link Interface process running on the management server can
use the Interface API functions to do the following:
❏ Pass messages from a legacy system to the internal message stream
of the management server,
❏ Read action requests from the management server,
❏ Write action responses.