Abstract: An entry station for an intercom system comprises a touch-screen user interface operable to facilitate a dialling function. A communications module is provided which is arranged to communicate with at least one destination terminal in accordance with the dialling function.

Abstract: A profiling system to precisely locate and define a position along a traveled path includes a vehicle module, the vehicle module further comprising a light source and a receiver, and a marker, the marker further comprising a light sensing device and a transmitter, wherein the marker is adapted to respond to the light source by transmitting a signal to the receiver.

Abstract: A digital computer has an addressable store 1, which may comprise segments 1a, 1b, etc. and a plurality of independent digital processing units 3a, 3b, etc. all communicating with the store 1 through a communication facility 2.Addresses in store 1 containing packets of digital data which require processing are held in a group of identifier stores 4a, 4b, etc. to which group the processing units all have access. Where processing results in the generation of fresh packets of data addresses for such data in store 1 are held in a second group of identifier stores 5a, 5b to which the processing units also have access. Controllers 6a, 6b, etc. and 7a, 7b, etc. ensure even transfer of identifier address among the stores of a group and act as interfaces between the identifier stores and the processing units.