Hey Darren,
You can use the SB-600 as a slave, but you have to use the camera's own built in flash or an SSB-800 as a commander - you cannnot use any other flash (not even the SB-600) as a commander.
When you use the camera's flash as commander, it only does the controlling pre-flashes, not any "exposure" flash, therefore only the light output from your slaves will affect the picture.
If you're doing portrait work, you'd probably need at least two SB-600's for the job, so that you can controll the shadow areas from the main flash with the second (set to lower output, perhaps) unit.
Personally, I use the SB-800 (x2), as they don't cost that much more, have higher output and can be used as a camera- or cord-connected master whilst also exposing on the picture...
I hope this helps.
Tim
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