A group of analysts and reporters got an extensive sneak peek at Windows 7 from Microsoft executives, but don't look for any research reports or articles about the session right away. To get the early preview of Microsoft's next operating system, those who attended had to agree not to disclose what they saw until it's shown publicly here later this week.

Non-disclosure or "NDA" briefings, as they're known, are common in the tech industry and on the Microsoft beat. But given the high level of interest in the next Windows version, and the chatty nature of some analysts and reporters, it will be interesting to see if this one survives without leaks. The session -- in an ironically windowless hotel conference room -- lasted about six hours, according to one person who was there. Windows executives including Steven Sinofsky and Mike Nash gave presentations, and others gave live demos.

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