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Parents who wonder which websites their children are surfing can now keep an eye on them—through the TV. Thomson Multimedia of France has developed what it calls a PC Sender, a gadget which plugs into a computer’s composite video port and uses the 2.4-gigahertz band to transmit whatever images are on the screen. With a teacup-sized transmitter dish, the Sender beams signals 30 metres. A matching receiver plugs into an ordinary TV set, and you assign it a channel of its own just like a VCR. So you can keep an eye on the computer screen at the press of…