WebTV for Dreamcast
From Sega Retro
WebTV for Dreamcast is a Japanese-only disc that allowed users of Microsoft's WebTV service to access the Internet from their Sega Dreamcast. The service, which debuted in Spring 1999, used the Windows CE capabilities of the Dreamcast to run a version of Internet Explorer 2.0. At the time of its release, the WebTV browser was an improvement over Sega's bundled Dream Passport software. By the release of Dream Passport 3, however, the Sega browser became more capable than WebTV. A later version of the WebTV disc included 128-bit SSL capabilities which were not present on the launch disc.
In total, there are four known WebTV for Dreamcast variants, each with their own user agent:
As the software requires a Japanese WebTV account, which are no longer available, the service can no longer be used on a Dreamcast.