1. First make two accounts at https://cogaccounts.codemasters.com/
2. Create a Character on each account.
3. Go to the merchant and buy "Ordinary Letter".
4. Take a Item from your Inventory (just normal items, no CC) and put it in a new mail.
5. Adress this Mail to a Character at your other Account.
6. Dissconect your Cable from your PC and press fast "Send" 2 times (or more if you want).Then reconnect.
7. Go to your other Account and press "U" to see your mails (You will have 2 new)
8. Dissconect again and press fast "open", "save" and "confirm" by both letters.
9. Reconnect with your Cable and after a few seconds you will get the message "item successful saved"
10. Now you will have the item 2 times.If you dont want the item go away after Server restart,create a guild and put it in "Guild Storage" at "Safe Keeper".

This Dupe works 100%.