Displays all the information avaialble from the keyboard. Press a key and see the ASCII value, the keycode values in both decimal and hex along with the modifier keys.
Pressing any cell in the ASCII chart will give directions on how to generate that symbol from the keyboard directly. There is also a full chart of the extended keyboard showing all the related keycodes. Changing the font from the pop-up button will show all the avaiable characters from that font.