And he is reaching out to the public to try to give the laptop campaign a boost. The marketing program, to be announced today, is called “Give 1 Get 1,” in which Americans and Canadians can buy two laptops for $399.

Image A childrens laptop, equipped with a camera and wireless communication ability.

One of the machines will be given to a child in a developing nation, and the other one will be shipped to the purchaser by Christmas. The donated computer is a tax-deductible charitable contribution. The program will run for two weeks, with orders accepted from Nov. 12 to Nov. 26.

Just what Americans will do with the slender green-and-white laptops is uncertain. Some people may donate them to local schools or youth organizations, said Walter Bender, president of the laptop project, while others will keep them for their own family or their own use.

The machines have high-resolution screens, cameras and peer-to-peer technology so the laptops can communicate wirelessly with one another. The machine runs on free, open source software. “Everything in the machine is open to the hacker, so people can poke at it, change it and make it their own,” said Mr. Bender, a computer researcher. “Part of what we’re doing here is broadening the community of users, broadening the base of ideas and contributions, and that will be tremendously valuable.”

The machine, called the XO Laptop, was not engineered with affluent children in mind. It was intended to be inexpensive, with costs eventually approaching $100 a machine, and sturdy enough to withstand harsh conditions in rural villages. It is also extremely energy efficient, with power consumption that is 10 percent or less of a conventional laptop computer.