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# 2.2.2 Using the Library

This topic describes the basic architecture of the USB Device Layer Library and provides information and examples on its use.

## Topics

Name | Description
Abstraction Model | Describes the Abstraction Model implemented by USB Device Layer.
Library Overview | The Device Layer Library provides API routines which allow the Harmony System module, function driver and the user application to interact with it. The library interface routines can be classified as shown in the table below.
How the Library Works | This topic describes the basic architecture of the USB Device Layer Library and provides information and examples on its use.