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# 3.2.2.3 How the Library Works

The Host Layer in the MPLAB Harmony USB Host Stack plays the key role of enumerating an attached device and facilitating the communication between the USB Host Client Driver and the attached devices. The following sections describe the steps and methods that the user application must follow to use the Host Layer (and the USB Host stack). The following topics are discusses:

- Host Layer Initialization
- Operating the Host layer
- Host Layer Application Events