We just had the cable card installed in our new HD DVR. I thought that a Pay- Per View had to be pre-arranged before it would be available. However, I noticed some channels in the Pay-Per View 500 series appear if they are tuned including some less than family rated material in the iN DEMAND 501-507 range. Does simply bringing up one of these channels result in getting billed for them? Exactly how does Pay-Per View work?