This functional application sample demonstrates how a user-mode application can enumerate USB host controllers-Usbview.exe is a Windows GUI application that allows you to browse all USB controllers and connected USB devices on your system. The left pane in the main application window displays a connection-oriented tree view, and the right pane displays the USB data structures pertaining to the selected USB device, such as the Device, Configuration, Interface, and Endpoint Descr iptors, as well as the current device configuration.