Swap trick with no Game Shark or Action replay

[plyah8a]

There is a swap method where you do not need a game shark or Action replay. On modchip.com they have a method where, in between the loading of Unreal you can put a backup in and it will catch and load the backup. Has anyone had any luck with it? I can get the trick to work, but I dont think my backups were made correctly. I made them with a cracked cdrwin. Let me know if anyone uses this trick.