Each lesson consists from the characters of a previous lesson, plus couple of new ones. New characters are indicated in the name of each lesson. Changes rules of test string generation. This may be useful when starting new batch of characters. It can be useful to practice skills when new characters are learned, and old ones are starting getting forgotten.
Time is time spent on typing the string.
Errors is a number of characters mistyped. GraphPlot.java Class GraphPlot responsible for drawing of the graphs. Netscape Navigator 3.x is preferred, since it will load the whole thing in one slurp, while previous versions would make separate connections to download each one of the seven used class files, which may be quite disturbing experience. It also may work with other browsers, but this is purely coincidental. This is shortcoming of a Java Window Toolkit and we haven't got strong enough incentive to fix it.