Whattheydonotwantyoutoknow.com is a website only accessible in Grand Theft Auto IV. The website lists pigeon, gun, armor, car, and health locations. It will also tell you all the cellphone cheats. After completing the game you get an email sending you the link to the website and notifying you about it. If you go to whattheydonotwantyoutoknow.com in real life, you will be taken to the Rockstar Games website.