Kairo/Pulse Help?

[Shade]

I just watched this movie again with my boyfriend. At the end of it he asked me what was going on and I found I couldn't explain it. I also had my own assumption as to what happened.

POSSIABLE SPOILERS

I.E. they were dead and just spilling out into a new world. But the more I thought about it the more I realized it didn't make sense. Someone help. It's driving me insane.

[MrShape]

I think the idea was that the afterlife was full, and the ghosts were escaping by switching places with living people through the web site.

[Shade]

Then what about the forbidden room?