He tried several methods, but among the most effective was a new computer progam called the Variant Annotation, Analysis and Selection Tool, or VAAST.

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Mr. Ballmer styled the new tablet device as a vehicle to exploit its forthcoming Windows 8 operating system, and a variant called Windows RT that relies on different kinds of computer chips.

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Like the original "I Love You, " this variant spreads itself via Microsoft's Outlook software and can delete image files from a user's computer.

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The YouTube video shows some of the various standard applications that come with the XO-1: Firefox, an unnamed instant messaging program, a variant of Abiword (word processing), and an application called eToys that looks like a combination of traditional computer games (such as Chinese Checkers) combined with something resembling the children's art program Kid Pix.

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