Well......

I purchased an Ipad for my wife and she wanted the 3gs network. So we tried to sign up with our PO box, but the wireless carrier, ATT, said it was not possible. Simply put "due to the taxation and security concerns we are not able to execute a 3gs plan without a valid address". Hmm.. I tried to change my credit card to another address, etc.

You want the answer: Give a fake mailing address. Correct, I picked an address from 15 years ago and I was online in three minutes. With all the advances in broadband, databases, Ajax, Java etc., the only way to establish connection to my Ipad was to use an antique address 1200 miles from my location.

Narrowcasting is loosely defined as the dissemination of information (usually by radio or television) to a narrow audience, not to the general public. (Wikipedia) Narrowcasting occurs when the producer of such television programming assumes that a specific demographic group is interested in a particular subject matter that appeals directly to them.
Today most programming is geared toward the general mass audience but many major networks are increasingly involved in narrowcasting. Program genres such as reality tv, sports, drama, comedy, just to name a few are all content and viewer specific. Networks have segmented these programs that appeal to particular groups into specific time slots, usually back to back.

The terms multicast and narrowcast are often used interchangeably, although narrowcast usually refers to the business model whereas multicast refers to the actual technology used to transmit the data (Inernet.com).