Text to a Cell Phone from a computer?

I got this question today...How to text to a cell phone from a computer...?

Here are the directions:

http://www.ehow.com/how_5140350_text-cell-phone-computer.html

You basically need and e-mail account and you need to know the person's cell phone number and their cellular provider:

For example, If the person you are texting has service with AT&T, address the text message to the ten digit cellular phone number then "@txt.att.net".

If  the person you are texting has service with Verizon, address the text message to the ten digit cellular phone number then "@vtext.com".