Representatives from the United States and nations that had sought to break up some of its control over the Internet reached an accord on Tuesday night that leaves the supervision of domain names and other technical resources unchanged. They agreed instead to an evolutionary approach to Internet management.

But the accord, a document of principles that delegates from more than 100 countries worked out here after more than two years of sometimes fiery argument, also established a new international forum intended to give governments a stronger voice in Internet policy issues, including the address system, a trade-off that the Americans were willing to accept.

The text of the document is to be approved at a United Nations summit meeting on information-age issues that begins Wednesday in Tunis.

American delegates who had been working on the document celebrated the outcome. Only in September, the European Union had made a well-received proposal to put some of the American powers under a new agency. And in the prelude to the talks that resumed this week, increasing pressure had been brought on the Americans to share their authority.

David A. Gross, coordinator of international communications and information policy in the State Department, said late Tuesday: "I didn't think it was possible. We did not change anything about the role of the U.S. government. It's very significant."

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