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# 3.4.2.2 Library Overview

The USB CDC Host Client Driver API is grouped functionally, as shown in the following table.

Library Interface Section | Description
Client Access Functions | These functions allow application clients to open, close the client and register event handlers. These functions are implemented in `usb_host_cdc.c`.
Data Transfer Functions | These functions allow the application client to transfer data to the attached device. These functions are implemented in `usb_host_cdc.c`.
CDC Class-specific Command Functions | These functions allow the application to send class specific control transfer requests to the application. These functions are implemented in `usb_host_cdc_acm.c`.