Japanese fans of Nintendo's dual-screen DS portable game machine may soon be able to <A HREF="http://news.zdnet.com/2100-1035_22-6039716.html?tag=zdnn.alert">surf the Web and watch high-def television</A> programs on their devices in addition to playing games. Taking another step in its strategy to develop features that will appeal to more than just hard-core game fans, the Japanese company said on Wednesday that it plans to begin selling a Web browser in June and launch a card with a digital television receiver by the end of the year. The company declined to give specific details on the television feature, but it said a card with an antenna will enable owners to watch television programs for mobile devices, which Japanese broadcasters are expected to begin offering from April 1. The Web browser, developed with Norway's Opera Software, will be sold as a DS card in June. Users will be able to insert the Wi-Fi card into the DS to browse the Internet in areas with wireless connectivity.