Well first off, you're going to have to be in all manual modes both on the camera and the flash - which means you can't use the Nikon's CLS/AWL since they use preflashes. I suppose you could use a TTL cord like the SC-28 for the sb-600 and the sync port for the AB, but that's not very useful so the easiest thing would be to use the SB-600 as a slave.
Unfortunately unlike the SB800 and 900, the SB-600 doesn't have a built in SU-4 mode so you'd need to buy an optical trigger. I like the stuff flashzebra has. You'd need one of these slaves:
FlashZebra.com: Optical Slave — Extended Range Version — with Female PC Connector — Sonia Brand (Item #0050)
and one of these hotshoe adapters that hooks into it and lets you mount the flash on a tripod or lightstand:
FlashZebra.com: Multipurpose Hotshoe Adapter (Item #0064)
Of course if you have sync cords, you can just buy one of those things and hook up the sync cord to it...