How to Dupe on 317 RSPS
If you want multiples of any item in RuneScape without having to work hard to do it, then duping is for you. You and a friend can create duplications, or "dupes", of any item you have in your inventory, even gold. This technique works on many RuneScape Private Servers (RSPS) — even a 317 server, part of RuneScape Classic and one of several types of servers available to RuneScape server hosts — because it uses a glitch in the server code. Expect duping, where its permitted, to take less than 5 minutes.
Create an account on a 317 server. There are many 317 servers to choose from, includings IX 317 Legacy 614. Check that the server you choose allows for duping. Because duping bypasses the normal route to building up your inventory, some servers do not allow it.
Find a friend you can dupe with. Duping requires two players to work and requires that they are both online at the same time.
Click on your friend. Select "Trade With."
Select the item you wish to dupe from your inventory. Place it in the trading inventory.
Select "Accept" to trade this item with your friend. Your friend should not trade you anything in return.
Quickly click on your friend again and select "Trade With" five or more times very quickly, spamming the request. Then quickly press "Log Out."
Log back in. Check your inventory. The item you traded away is still there in your inventory. But your friend also has it. It has been duped.