In November, you’ll be able to buy a new laptop that’s spillproof, rainproof, dustproof and drop-proof. It’s fanless, it’s silent and it weighs 3.2 pounds. One battery charge will power six hours of heavy activity, or 24 hours of reading. The laptop has a built-in video camera, microphone, memory-card slot, graphics tablet, game-pad controllers and a screen that rotates into a tablet configuration.

And this laptop will cost $200.

The computer, if you hadn’t already guessed, is the fabled “$100 laptop” that’s been igniting hype and controversy for three years. It’s an effort by One Laptop Per Child (laptop.org) to develop a very low-cost, high-potential, extremely rugged computer for the two billion educationally underserved children in poor countries.

The concept: if a machine is designed smartly enough, without the bloat of standard laptops, and sold in large enough quantities, the price can be brought way, way down. Maybe not down to $100, as O.L.P.C. originally hoped, but low enough for developing countries to afford millions of them — one per child.

The laptop is now called the XO, because if you turn the logo 90 degrees, it looks like a child.

O.L.P.C. slightly turned its strategy when it decided to offer the machine for sale to the public in the industrialized world — for a period of two weeks, in November. The program is called “Give 1, Get 1,” and it works like this. You pay $400 (www.xogiving.org). One XO laptop (and a tax deduction) comes to you by Christmas, and a second is sent to a student in a poor country.