Duplicating Runescape Items
First of all you should know that there is no longer any way to start duplicating any runescape items. So if anyone tells you different, they are trying to scam you some how.
Remember, never give out your password.
There used to be a way for you to hack the original runescape, commonly called runescape classic, however, that was patched very quickly and cannot ever occur again.
If you find a website that advertises anything related to runescape item duplicating, then just ignore them as they will tell you nothing but lies.
In fact, if you download a piece of software from these sites, they will probably contain key loggers. These things will record you typing in your username and password so the hacker can steal it.
You're account will then be banned or taken over, either way you wont have access to your account ever again.