- Hewlett-Packard Printer User Guide

Using the VPO Application Programming Interfaces

Overview of the VPO APIs

Chapter 4 165

Overview of the VPO APIs

VPO provides several APIs to VPO functions which enable a

knowledgeable user to enhance the operations and problem management

of VPO. This chapter provides an overview of all available APIs—they

are described in more detail in the VPO Developer’s Reference. The APIs

can be further subdivided into the:

❏ VPO Operator APIs

The VPO Operator APIs provide a set of functions that allow you to

operate on VPO messages, message events, and application

responses, for example to own or disown a message.

This group of APIs also includes the Interface API. The Interface API

provides a set of functions that allow access to VPO by opening one of

the following interfaces:

• Server Message Stream Interface

• Agent Message Stream Interface

• Legacy Link Interface

• Application Response Interface

• Message Event Interface

The VPO Interfaces use the Interface API functions to register with

VPO to receive data. When the requested data is available, VPO

sends it to the instance of the interface which made the request.

❏ VPO Conﬁguration APIs

The VPO Conﬁguration APIs provide a set of functions to conﬁgure

VPO data directly in the database. The functions allow you, for

example to conﬁgure new VPO templates or managed nodes, or to

modify existing applications or users. In addition, functions are

available to control access to VPO data, and to distribute your

conﬁguration changes to the managed nodes.