Ant6n wrote this application for a class project in machine learning. He wants to create a model on how fast an average (trained) user can tap up a given button combination.

Quote:

This tool lets you press button combinations and records the speed. It gives you multiple attempts, so that you can get your thumbs to be as fast as possible. It then uploads the data to my server via wifi and prints some stats in comparison to other users. So you get to know how fast your thumbs are compared to others.

http://forum.gbadev.org/viewtopic.php?t=16983