Keypress will sniff key presses on a page and trigger various events or actions. For the amount of features it supports, its size is incredibly low.
The library can be used in many ways. For online browser games, to enhance a site's navigation system, for online PowerPoint-like business presentations, in traffic analysis scripts and many other more.
Just to list some of the incredible things it can do: bind actions to any key press, work with key down or key up events, count what and how many times a key has been pressed, assemble keyboard combos, enforce a key press order and provide support for multiple keys being pressed at the same time.
In the end, we can say it's a pretty nifty tool, since the Web revolves so much around the concept of interaction.
Check out the Keypress source code on GitHub.
Download Keypress from our Scripts section here.