TCjr,
When you say "tie all these to a single triggered event" are you wanting all boards to start acquiring upon a single start trigger signal? If so, there are numerous examples that illustrate how to route this trigger signal over the RTSI bus. Most of these examples specifically state for E Series, but the S Series boards should work as well. The only time a program wouldn't work for an S Series board is if it is specifically setting the channel clock, which the S Series boards do not have. Below are links to a couple of the examples. I hope these help.
Digital TriggerAnalog Trigger