#6. "RE: How to set SB-800 to Manual and Remote" In response to In response to 4
As I wrote below, there are two options (SU-4 (Optical slave mode) or CLS Wireless Flash Control).
There is a third option and that is to use RF triggers. The advantage over SU-4 mode is that your remotes will not be triggered by other Photographers using flash near your remote Speedlights. Good Luck and Enjoy your Nikons!