The arrow keys can also be used to adjust kerning and tracking. Pressing
Option + Left or Right either kerns or tracks 20 units depending on whether
or not a type selection is active (i.e. if the cursor is between two characters,
kerning is applied; if multiple characters are selected, then tracking is
adjusted). The increment can also be changed to 100 units using Command
- Option + Left or Right arrow. Finally, the baseline can be shifted by 2 or
10 points using Option + Shift + Up or Down arrow or Command + Option - Shift + Up or Down arrow, respectively.