Best is to google game genie codes for whatever game and type in the code in cheats, add code in the emulator
you cant you can buy a gameshark heres the site http://store.gameshark.com/GameShark-Handheld
1. Depends on the emulator 2. Don't cheat.
Yes, you must click on the "cheats" button on the emulator and then type in the code.
If by cheats you mean Action Replay/Gameshark codes, you need to buy them at Wal=Mart/Best Buy/Circuit City. You MUST have the devices to use the cheats. There is no other way to cheat!