libusb Developers Guide
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III. Control Transfers

This group of functions allow applications to send messages to the default control pipe.

Table of Contents
usb_control_msg -- Send a control message to a device
usb_get_string -- Retrieves a string descriptor from a device
usb_get_string_simple -- Retrieves a string descriptor from a device using the first language
usb_get_descriptor -- Retrieves a descriptor from a device's default control pipe
usb_get_descriptor_by_endpoint -- Retrieves a descriptor from a device
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