Installed on the computer where the USB device is physically plugged in. It "shares" the device over the network.

You don’t need the device drivers on the Server side—only on the Client machine where the device is actually being used. Why Users Look for the "Full" Version

Supports everything from mass storage devices and cameras to complex medical equipment and CNC controllers.

Accessing expensive CAD or Video Editing software dongles located in a secure server room.