As she hosted the noontime news on Reno's KRNV News 4 last week, Melissa Carlson sought the opinions of a quartet of viewers from around the world.What, she asked, did the viewer in the United Kingdom think of new school uniform rules in Brazil? What did the viewers in Reno and Canada think of President Obama's performance at a press conference?The real-time interactive news programming launched by the Reno station is among the first of its type in the world, although a handful of broadcast news organizations are beginning to follow the lead of KRNV.The technology at the heart of …