The BBC News website visited Nigeria to see Africa's first large scale test of the XO laptop - a portable computer designed for the world's poorest children.
The One Laptop Per Child Project's so-called $100 laptop, also known as the XO, incorporates technology and software specially developed to cope with the inhospitable conditions found in many developing nations.
Created at the Massachusetts Institute of Technology in the US, the XO is now being handed out around the world.
1. '$100 LAPTOP' FOUNDER
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$100 Laptop founder Nicholas Negroponte says he ignores criticism of the project.
The entire ethic of the OLPC Project has come in for criticism from aid agencies and governments.
Some believe its business model is flawed and that money could be better spent on basic necessities or training teachers.
2. THE XO IN NIGERIA
Rory Cellan-Jones visited Galadima Primary School on the outskirts of Abuja, Nigeria where children are testing the XO.
But the government has voiced reservations about whether the project is worth the cost.
3. ENERGY-SAVING INNOVATIONS
The XO laptop has unique methods of conserving battery power. Its screen is lit by daylight and it has no electrically powered moving parts.
These technologies mean it can run for about 24 hours without being recharged.
4. 'Y0-YO' BATTERY CHARGER
The XO is designed to be used in remote areas where electricity is in short supply.
The designers have developed various methods of recharging the laptop, including a ripcord charger for children to recharge the battery by hand.
5. EDUCATIONAL SOFTWARE
The operating system of the XO laptop is based on Linux open source software.
Educational packages in commonly used languages have been loaded onto each notebook, as Rory Cellan-Jones explains.
6. LIFTING THE HOOD
Click's Andrew Webb travelled to the Massachusetts Institute of Technology to meet the XO's designers and software writers.
He reports on how engineers had to ignore convention when developing the device.
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