Abstract: A desk attachment includes a base unit 1 including a communication bus having a communication port for connection to at least one remote signal source. A plurality of user modules 20 are provided for attachment to the base unit such that they are electrically connected with the bus. Each module has a PC port 22 for connection with a local computer and at least one peripheral port 23 for connection with a user interface device. The ports are arranged such that a computer on the PC port is operably connected to the or each peripheral port and the bus.