Microsoft's Satya Nadella checks out the Micro Bit computer
London's Eastlea Community School has had a visit from a technology VIP.
Microsoft's chief executive Satya Nadella dropped in to see what the children were doing with a tiny computer.
The device is the Micro Bit, which is going to be given to every year seven child in the UK as part of the BBC's Make It Digital project.
The pupils had been given early access to the device and had come up with inventive ways to program it.
Mr Nadella announced that Microsoft planned to buy 15,000 additional Micro Bits when they became commercially available in 2016 and would provide them to 35 UK schools, so that other children could benefit.
Earlier, he had announced that Microsoft would open data centres in the UK for the first time next year.
He spoke to the BBC's technology correspondent Rory Cellan-Jones about both the Micro Bit and data privacy.