"The technology exists to do this today," Sohn said. "We are interested in driving that forward but we aren't interested in waiting around."
AOL Time Warner Inc, whose America Online is the biggest Internet-service provider, is developing a similar log-in system. AOL Time Warner has also been invited to join the Alliance, Palo Alto, California-based Sun said. The company said it's examining its options.
"More than one system in this space is good for the industry and we are currently evaluating the entire range of architecture and designs possibilities," spokesman Andrew Weinstein said.
Single-log-in features are gaining popularity as consumers buy more goods and services on line. That's created reams of data for service providers, and heightened security concerns.
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