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The Vendor class allows you to build vendor-specific devices that can implement a proprietary protocol. It relies on a pair of bulk endpoints to transfer data between the host and the device. Bulk transfers are convenient for transferring large amounts of unstructured data and provide a reliable exchange of data by using an error detection and retry mechanism.

In addition to bulk endpoints, the Vendor class can also use an optional pair of interrupt endpoints. Any operating system (OS) can work with the Vendor class provided that the OS has a driver to handle the Vendor class. Depending on the OS, the driver can be native or vendor-specific. For instance, under Microsoft Windows®, your application interacts with the WinUSB driver provided by Microsoft to communicate with the vendor device.

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