A Network USB Server Bus XP Windows driver is a device driver specifically designed for Windows XP to allow computers to access USB devices (such as printers, scanners, storage devices, etc.) that are connected to a Network USB Server. A Network USB Server is a device or software solution that makes USB peripherals accessible over a network, allowing multiple computers to use a single USB device as if it were directly connected to them.

In the context of Windows XP, the Network USB Server Bus driver is required to enable the Windows XP operating system to detect and use the USB device over the network, even though it's physically connected to a separate machine or network server.