420 EX Flash, second curtain?

I've been looking at the 420 ex as my flash unit, and can't seem to get the answer I'm looking for. Here it is, does this flash allow for second curtain synch with the digi reb? The B&H site refers to rear curtain sync, which I'm assuming is the second curtain, but I can't find a source that clearly states second curtain. I like photo's with streaks of light, and prefer the flash at the and of the action rather than the begining. Hopefully somebody can help with this.