AGET Pivot and Smart Pivot, whats the differnece?

[Ainsley]

Can anyone shed some light on what the difference between the normal Pivot and Smart Pivot is?

AGet.pivots( ReturnSeries [, sym() | inv() ][, BarIndex ] )?

Return Series
NONE = 0
PIVOT_UP = 1
PIVOT_DOWN = -1
SMART_PIVOT_UP = 2
SMART_PIVOT_DOWN = -2?