# Introduction

Usage and Billing for Windows Azure Pack has four components. All of these can be installed from their respective installers:

1. API Service – IIS Web Application
2. Aggregation Service – Windows Service
3. Admin Extension – Windows Azure Pack Admin Portal Extensions
4. Tenant Extension – Windows Azure Pack Tenant Portal Extensions

These components can be installed on the same machine or multiple machines.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.cloudassert.com/wap-billing/master.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.