The machines, made by Acer and Samsung, will go on sale next month.

Unlike conventional computer systems which use installed software like Microsoft Word, Chrome is built around web-based applications such as Google Docs. Some analysts have questioned whether users will want laptops that rely so heavily on an internet connection.

However, Google co-founder Sergey Brin, hailed the technology as a "new model of computing". His comments came on the second day of the company's developer conference, where Google announced that so-called Chromebooks will go on sale in June. Samsung and Acer will be the first manufacturers to offer the devices, for between $349 and $499, in the US and six European countries initially.

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