USRP Hardware Driver and USRP Manual  Version:
UHD and USRP Manual
The Module Peripheral Manager (MPM) Architecture

The Module Peripheral Manager (MPM) is a software process that continually runs on a USRP device, and allows access to its peripherals through a network-capable API. This way, it does not matter whether or not it is being accessed locally or remotely, as long as it is possible to open an network socket to the device.

For all MPM-capable devices, a single USRP/UHD driver is sufficient.