The S&W Complete Rulebook, at page 42, states that you roll 2d10 and consult the Turning Undead table for the result. Then, interpretation is offered as so:
If the number on the dice is equal to or greater than the number shown on the table, 2d6 creatures of the targeted type are turned and will depart, not returning for 3d6 rounds.
If the table indicates “T,” 2d6 undead creatures of the targeted type are automatically turned and will depart for 3d6 rounds.
It makes no further reference to this. What's the difference between turning undead regularly and turning undead automatically?