1 of 12 World Record Guinness World Records congratulates developers for setting an official record for the Most Participants in a Software Development Marathon at the Windows AppFest. Pictured from left to right are: Jon DeVaan, corporate vice president, Windows development at Microsoft; Bhaskar Pramanik, chairman of Microsoft India; and Paul O’Neill, vice president of Guinness World Records, Commercial.

2 of 12 Checking In Thousands of developers register for the Windows 8 AppFest in Bangalore, which took place Sept. 21 through 22.

3 of 12 Welcome, Ladies Women were well-represented among the coders. This group of young ladies is ready to get their code on.

4 of 12 Sample Apps Jon DeVaan, corporate vice president, Windows development at Microsoft, shows a sample of apps built by India’s talented developers at the Windows AppFest press conference.

5 of 12 The Countdown Begins Jon DeVaan, corporate vice president, Windows development at Microsoft, hits the gong to signal the start of Windows AppFest as thousands of developers are ready to start the 18-hour, nonstop coding marathon in Bangalore.

6 of 12 And They’re Off More than 2,500 developers begin coding as part of the 18-hour marathon.

7 of 12 Collaboration The teams of up to four members build, design and test Windows 8 apps at AppFest.

8 of 12 Hard at Work Despite the long hours coding, the developer teams remained intent on delivering apps for Windows 8.

9 of 12 Swarathma Rock band Swarathma entertains developers deep into the night at the Windows 8 AppFest.

10 of 12 Yoga As dawn rises, developers are re-energized with a session of yoga at Windows 8 AppFest.

11 of 12 Cat Nap An exhausted developer catches a little sleep during the 18-hour, nonstop Windows 8 AppFest.