I'd like to experiment with the on camera flash + the SB600 off camera. I tried reading the SB-600 instruction manual for details, but it didn't make much sense to me. How can I use my SB-600 as an off-camera flash with my D90? Am I correct in my understanding that all I need is an SC-29 cord to connect the two? Links to tutorials or minimally difficult hacks would be appreciated.