There were several different videos, each with multiple scenarios. You stood facing the screen, wearing all your tactical gear, and as previously stated we used snap caps. With each scenario, you had to make the decision of the appropriate course of action (shoot - don't shoot) based on the unfolding action of the scenario.
Although it is impossible to emulate EVERY situation you may encounter, I found it a useful tool to help demonstrate the intent of our ROE (rules of engagement). If you didn't pass, you were no longer on a boarding team until you could pass. You never saw the same video twice.
The program was never intended to cover all aspects or scenarios, but to help demonstrate the practical application of what can sometimes be a dry and abstract policy. It made you think on the fly, and I thought it was WAY FUN TOO
This was all law enforcement based, and I'm not sure what a civilian based program would look like (scenario wise), or how effective it would be, but it was one of the best "video games" that I ever played.