Tabbing Between Fields
To tab between fields on a form:
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Click in a field, then press Tab to move from field to field, and within each column if you have added a column divider. Press Shift-Tab to move in the reverse direction.
Note  To enable the Tab key to move to all controls, make sure “All controls” is selected in the Keyboard and Mouse (Mac OS X 10.6) or Keyboard (OS X Lion 10.7) preferences (Keyboard Shortcuts tab).