Certainly. SU-4 is the mode (not available on the SB-600) that simply has the flash react to a very sudden change in lighting. It goes through some filtering to try and ignore the TTL preflash and in my experience it does so quite reliably. But basically if it sees another flash fire via it's infra-red sensor it will trigger itself.
Unlike wireless-CLS which encodes all the flash information and TTL information into the preflash, SU-4 mode works as a dumb unit. All your settings such as Power, A / M modes, are all controlled on the flash unit itself, and as there is no communication between the flash and the camera TTL does not work. But these downsides are far outweighed by the benefit of being able to use it wirelessly with any camera.