This hack can be installed in your friends' user accounts (in ~/Library/InputManagers) on a Mac OS X system and will cause typos to be introduced when they are typing relatively quickly in Cocoa apps. Several different flavors of typos are generated on a random basis. The bundle should be tuned to generate typos fairly infrequently for maximum effect.
For the purposes of demoing, the source as shipped generates typos way more often than it really ought to.
