IMO it is more of another way to use your intuition rather than literally seeing something somewhere across the world. I've had some interesting experiences that I posted some time back on a thread titled "finding lost objects." The first technique was just using hypnosis to find things I misplaced but later I posted an update on how I found a cell phone that I should not have been able to find because I was not the one who lost it nor was I there when it was lost.
I'm pretty sure the Silva RV method is different from the Technical Remote Viewing that the government experimented with. I don't know how effective that was, but the government will spend millions on just about anything, so believing that they did this is no stretch for me. 
One of the people promoting this was on the Art Bell show shortly after 9-11-01. According to him it takes a highly trained and experienced remote viewer to carry out this mission. He said the enemy was aware of these techniques and came up with ways to foil them, such as holding meetings in a tent that is inside a cave so the RVer would think they are based in a tent.
