Google Inc. is working on a new operating system for inexpensive computers in a daring attempt to wrest away Microsoft Corp.'s long-running control over people's computing experience.

The new operating system, announced late Tuesday night on Google's Web site, will be based on the company's nine-month-old Web browser, Chrome. Google intends to rely on help from the community of open-source programmers to develop the Chrome operating system, which is expected to begin running computers in the second half of 2010.

The Mountain View, Calif.-based company disclosed its plans for the operating system shortly after an online technology news service, Ars Technica, and The New York Times telegraphed the news on their Web sites.

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