They were both connected to the same hub. We could see at a glance that we had two USB-connected devices a USB key, and a mouse. We found this approach immediately provided us with useful data. Clicking any of these then displays a text report on the right with more information. On the left is a tree representing your computer, USB controllers, hubs and devices. The program has a straightforward two-pane interface. USB Device Tree Viewer is something like a USB-oriented Device Manager, showing all your USB controllers and hubs and giving you a vast amount of detail on everything connected to them.