1. A television viewing center system having capability for receiving, along with radio-transmitted television signals, supplementary information signals radiotransmitted with the television signals from the same transmitter and relating to transmitted television signals, comprising, in combination: a receiving stage for receiving television signals from a remote source by cable or an antenna, said stage including first and second television reception tuners (2,3) and tuner control means (31,32,37) for controlling the tuning of said tuners; a data separateion stage (4) connected for receiving the output of said second tuner (3); a programmable control stage (6,47) having three outputs and first, second and third inputs responsive to digital signals received from said data separation stage (4) and to other digital signals supplied from at least one source (30,34) within the viewing center system, for providing control signals from a first of said outputs to said tuner control means (31,32,37) and from a second and a third of said outputs to other components of the system, said programmable control stage including means for causing said second tuner to scan stepwise a set of receiving channels for obtaining said supplementary information signals therefrom and also means for evaluating supplementary signals thereby obtained with reference to information stored in said control stage; a signal source transfer switching unit (7,47) for switching composite video signals and audio signals related thereto from any of a plurality of sources, including said first television reception tuner, to any of a plurality of outputs, said transfer switching unit being connected, for control of its operation, to said second output of said programmable control stage; a television display unit (8) having a television picture screen (9) and connected to an output of said transfer switching unit; means responsive to data separated from the output of said second television reception signals through said transfer switching unit to said television display unit (8) for displaying supplementary information on the television screen (9) thereof; a sound reproduction system including at least one loudspeaker and at least one audio amplifier (10,11,12) and connected to an output of said transfer switching unit; means for recording and reproducing television signals (13,14), connected to an output and to an input of said transfer switching unit; a plurality of additional television signal sources (15,16,17) connected respectively to a plurality of inputs to said transfer switching unit; output digital data bus means connecting said third output of said programmable control stage (6,47) for control purposes of said television display unit (8), said sound reproduction system (10,11,12), said television recording and reproducing means (13,14) and said additional television signal sources (15,16,17); a remote control receiver (30), having its output connected with an input of said programmable control stage, for providing signals including signals to be stored in said programmable control stage, and remote control manually operable programmable means (5), for providing signals to said remote control receiver (30) from locations in the general vicinity of said receiver, having therein means for sensing the display of said supplemental information on said screen for supplying said information through said remote control receiver (30) to said programmable control stage, and means for producing a controllable cursor signal for selecting supplementary information displayed on said screen in response to digital signals provided by said data separation stage (4) and causing the information selected by said cursor to be provided as an input to said programmable control stage.